Page 1
Chapter 9: HCF-LCM
PRACTICE SET 23 [PAGE 46]
Practice Set 23 | Q 1 | Page 46
Write all the factor of the given number and list their common factor.
12, 16
SOLUTION
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 16: 1, 2, 4, 8, 16
Common factors of 12 and 16: 1, 2, 4
Practice Set 23 | Q 2 | Page 46
Write all the factor of the given number and list their common factor.
21, 24
SOLUTION
Factors of 21: 1, 3, 7, 21
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 21 and 24: 1, 3
Practice Set 23 | Q 3 | Page 46
Write all the factor of the given number and list their common factor.
25, 30
SOLUTION
Factors of 25: 1, 5, 25
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 25 and 30: 1, 5
Practice Set 23 | Q 4 | Page 46
Write all the factor of the given number and list their common factor.
24, 25
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 25: 1, 5, 25
Common factors of 24 and 25: 1
Page 2
Chapter 9: HCF-LCM
PRACTICE SET 23 [PAGE 46]
Practice Set 23 | Q 1 | Page 46
Write all the factor of the given number and list their common factor.
12, 16
SOLUTION
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 16: 1, 2, 4, 8, 16
Common factors of 12 and 16: 1, 2, 4
Practice Set 23 | Q 2 | Page 46
Write all the factor of the given number and list their common factor.
21, 24
SOLUTION
Factors of 21: 1, 3, 7, 21
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 21 and 24: 1, 3
Practice Set 23 | Q 3 | Page 46
Write all the factor of the given number and list their common factor.
25, 30
SOLUTION
Factors of 25: 1, 5, 25
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 25 and 30: 1, 5
Practice Set 23 | Q 4 | Page 46
Write all the factor of the given number and list their common factor.
24, 25
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 25: 1, 5, 25
Common factors of 24 and 25: 1
Practice Set 23 | Q 5 | Page 46
Write all the factor of the given number and list their common factor.
56, 72
SOLUTION
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Common factors of 56 and 72: 1, 2, 4, 8
PRACTICE SET 24 [PAGE 47]
Practice Set 24 | Q 1.01 | Page 47
Find the HCF of the following number.
45, 30
SOLUTION
Factors of 45: 1, 3, 5, 9, 15, 45
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 45 and 30: 1, 3, 5, 15
? HCF of 45 and 30 = 15
Practice Set 24 | Q 1.02 | Page 47
Find the HCF of the following number.
16, 48
SOLUTION
Factors of 16: 1, 2, 4, 8, 16
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Common factors of 16 and 48: 1, 2, 4, 8, 16
? HCF of 16 and 48 = 16
Practice Set 24 | Q 1.03 | Page 47
Find the HCF of the following number.
39, 25
SOLUTION
Factors of 39: 1, 3, 13, 39
Page 3
Chapter 9: HCF-LCM
PRACTICE SET 23 [PAGE 46]
Practice Set 23 | Q 1 | Page 46
Write all the factor of the given number and list their common factor.
12, 16
SOLUTION
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 16: 1, 2, 4, 8, 16
Common factors of 12 and 16: 1, 2, 4
Practice Set 23 | Q 2 | Page 46
Write all the factor of the given number and list their common factor.
21, 24
SOLUTION
Factors of 21: 1, 3, 7, 21
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 21 and 24: 1, 3
Practice Set 23 | Q 3 | Page 46
Write all the factor of the given number and list their common factor.
25, 30
SOLUTION
Factors of 25: 1, 5, 25
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 25 and 30: 1, 5
Practice Set 23 | Q 4 | Page 46
Write all the factor of the given number and list their common factor.
24, 25
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 25: 1, 5, 25
Common factors of 24 and 25: 1
Practice Set 23 | Q 5 | Page 46
Write all the factor of the given number and list their common factor.
56, 72
SOLUTION
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Common factors of 56 and 72: 1, 2, 4, 8
PRACTICE SET 24 [PAGE 47]
Practice Set 24 | Q 1.01 | Page 47
Find the HCF of the following number.
45, 30
SOLUTION
Factors of 45: 1, 3, 5, 9, 15, 45
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 45 and 30: 1, 3, 5, 15
? HCF of 45 and 30 = 15
Practice Set 24 | Q 1.02 | Page 47
Find the HCF of the following number.
16, 48
SOLUTION
Factors of 16: 1, 2, 4, 8, 16
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Common factors of 16 and 48: 1, 2, 4, 8, 16
? HCF of 16 and 48 = 16
Practice Set 24 | Q 1.03 | Page 47
Find the HCF of the following number.
39, 25
SOLUTION
Factors of 39: 1, 3, 13, 39
Factors of 25: 1, 5, 25
Common factors of 39 and 25: 1
? HCF of 39 and 25 = 1
Practice Set 24 | Q 1.04 | Page 47
Find the HCF of the following number.
49, 56
SOLUTION
Factors of 49: 1, 7, 49
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Common factors of 49 and 56: 1, 7
? HCF of 49 and 56 = 7
Practice Set 24 | Q 1.05 | Page 47
Find the HCF of the following number.
120, 144
SOLUTION
Factors of 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
Factors of 144: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
Common factors of 120 and 144: 1, 2, 3, 4, 6, 8, 12, 24
? HCF of 120 and 144 = 24
Practice Set 24 | Q 1.06 | Page 47
Find the HCF of the following number.
81, 99
SOLUTION
Factors of 81: 1, 3, 9, 27, 81
Factors of 99: 1, 3, 9, 11, 33, 99
Common factors of 81 and 99: 1, 3, 9
? HCF of 81 and 99 = 9
Practice Set 24 | Q 1.07 | Page 47
Find the HCF of the following number.
24, 36
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Page 4
Chapter 9: HCF-LCM
PRACTICE SET 23 [PAGE 46]
Practice Set 23 | Q 1 | Page 46
Write all the factor of the given number and list their common factor.
12, 16
SOLUTION
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 16: 1, 2, 4, 8, 16
Common factors of 12 and 16: 1, 2, 4
Practice Set 23 | Q 2 | Page 46
Write all the factor of the given number and list their common factor.
21, 24
SOLUTION
Factors of 21: 1, 3, 7, 21
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 21 and 24: 1, 3
Practice Set 23 | Q 3 | Page 46
Write all the factor of the given number and list their common factor.
25, 30
SOLUTION
Factors of 25: 1, 5, 25
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 25 and 30: 1, 5
Practice Set 23 | Q 4 | Page 46
Write all the factor of the given number and list their common factor.
24, 25
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 25: 1, 5, 25
Common factors of 24 and 25: 1
Practice Set 23 | Q 5 | Page 46
Write all the factor of the given number and list their common factor.
56, 72
SOLUTION
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Common factors of 56 and 72: 1, 2, 4, 8
PRACTICE SET 24 [PAGE 47]
Practice Set 24 | Q 1.01 | Page 47
Find the HCF of the following number.
45, 30
SOLUTION
Factors of 45: 1, 3, 5, 9, 15, 45
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 45 and 30: 1, 3, 5, 15
? HCF of 45 and 30 = 15
Practice Set 24 | Q 1.02 | Page 47
Find the HCF of the following number.
16, 48
SOLUTION
Factors of 16: 1, 2, 4, 8, 16
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Common factors of 16 and 48: 1, 2, 4, 8, 16
? HCF of 16 and 48 = 16
Practice Set 24 | Q 1.03 | Page 47
Find the HCF of the following number.
39, 25
SOLUTION
Factors of 39: 1, 3, 13, 39
Factors of 25: 1, 5, 25
Common factors of 39 and 25: 1
? HCF of 39 and 25 = 1
Practice Set 24 | Q 1.04 | Page 47
Find the HCF of the following number.
49, 56
SOLUTION
Factors of 49: 1, 7, 49
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Common factors of 49 and 56: 1, 7
? HCF of 49 and 56 = 7
Practice Set 24 | Q 1.05 | Page 47
Find the HCF of the following number.
120, 144
SOLUTION
Factors of 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
Factors of 144: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
Common factors of 120 and 144: 1, 2, 3, 4, 6, 8, 12, 24
? HCF of 120 and 144 = 24
Practice Set 24 | Q 1.06 | Page 47
Find the HCF of the following number.
81, 99
SOLUTION
Factors of 81: 1, 3, 9, 27, 81
Factors of 99: 1, 3, 9, 11, 33, 99
Common factors of 81 and 99: 1, 3, 9
? HCF of 81 and 99 = 9
Practice Set 24 | Q 1.07 | Page 47
Find the HCF of the following number.
24, 36
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
Common factors of 24 and 36: 1, 2, 3, 4, 6, 12
? HCF of 24 and 36 = 12
Practice Set 24 | Q 1.08 | Page 47
Find the HCF of the following number.
25, 75
SOLUTION
Factors of 25: 1, 5, 25
Factors of 75: 1, 3, 5, 15, 25, 75
Common factors of 25 and 75: 1, 5, 25
? HCF of 25 and 75 = 25
Practice Set 24 | Q 1.09 | Page 47
Find the HCF of the following number.
48, 54
SOLUTION
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54
Common factors of 48 and 54: 1, 2, 3, 6
? HCF of 48 and 54 = 6
Practice Set 24 | Q 1.10 | Page 47
Find the HCF of the following number.
150, 225
SOLUTION
Factors of 150: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150
Factors of 225: 1, 3, 5, 9, 15, 25, 45, 75, 225
Common factors of 150 and 225: 1, 3, 5, 15, 25, 75
? HCF of 150 and 225 = 75
Practice Set 24 | Q 2 | Page 47
If large square beds of equal size are to be made for planting vegetables on a plot of
land 18 meters long and 15 meters wide, what is the maximum possible length of each
bed?
Page 5
Chapter 9: HCF-LCM
PRACTICE SET 23 [PAGE 46]
Practice Set 23 | Q 1 | Page 46
Write all the factor of the given number and list their common factor.
12, 16
SOLUTION
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 16: 1, 2, 4, 8, 16
Common factors of 12 and 16: 1, 2, 4
Practice Set 23 | Q 2 | Page 46
Write all the factor of the given number and list their common factor.
21, 24
SOLUTION
Factors of 21: 1, 3, 7, 21
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 21 and 24: 1, 3
Practice Set 23 | Q 3 | Page 46
Write all the factor of the given number and list their common factor.
25, 30
SOLUTION
Factors of 25: 1, 5, 25
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 25 and 30: 1, 5
Practice Set 23 | Q 4 | Page 46
Write all the factor of the given number and list their common factor.
24, 25
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 25: 1, 5, 25
Common factors of 24 and 25: 1
Practice Set 23 | Q 5 | Page 46
Write all the factor of the given number and list their common factor.
56, 72
SOLUTION
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Common factors of 56 and 72: 1, 2, 4, 8
PRACTICE SET 24 [PAGE 47]
Practice Set 24 | Q 1.01 | Page 47
Find the HCF of the following number.
45, 30
SOLUTION
Factors of 45: 1, 3, 5, 9, 15, 45
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Common factors of 45 and 30: 1, 3, 5, 15
? HCF of 45 and 30 = 15
Practice Set 24 | Q 1.02 | Page 47
Find the HCF of the following number.
16, 48
SOLUTION
Factors of 16: 1, 2, 4, 8, 16
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Common factors of 16 and 48: 1, 2, 4, 8, 16
? HCF of 16 and 48 = 16
Practice Set 24 | Q 1.03 | Page 47
Find the HCF of the following number.
39, 25
SOLUTION
Factors of 39: 1, 3, 13, 39
Factors of 25: 1, 5, 25
Common factors of 39 and 25: 1
? HCF of 39 and 25 = 1
Practice Set 24 | Q 1.04 | Page 47
Find the HCF of the following number.
49, 56
SOLUTION
Factors of 49: 1, 7, 49
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Common factors of 49 and 56: 1, 7
? HCF of 49 and 56 = 7
Practice Set 24 | Q 1.05 | Page 47
Find the HCF of the following number.
120, 144
SOLUTION
Factors of 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
Factors of 144: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
Common factors of 120 and 144: 1, 2, 3, 4, 6, 8, 12, 24
? HCF of 120 and 144 = 24
Practice Set 24 | Q 1.06 | Page 47
Find the HCF of the following number.
81, 99
SOLUTION
Factors of 81: 1, 3, 9, 27, 81
Factors of 99: 1, 3, 9, 11, 33, 99
Common factors of 81 and 99: 1, 3, 9
? HCF of 81 and 99 = 9
Practice Set 24 | Q 1.07 | Page 47
Find the HCF of the following number.
24, 36
SOLUTION
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
Common factors of 24 and 36: 1, 2, 3, 4, 6, 12
? HCF of 24 and 36 = 12
Practice Set 24 | Q 1.08 | Page 47
Find the HCF of the following number.
25, 75
SOLUTION
Factors of 25: 1, 5, 25
Factors of 75: 1, 3, 5, 15, 25, 75
Common factors of 25 and 75: 1, 5, 25
? HCF of 25 and 75 = 25
Practice Set 24 | Q 1.09 | Page 47
Find the HCF of the following number.
48, 54
SOLUTION
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54
Common factors of 48 and 54: 1, 2, 3, 6
? HCF of 48 and 54 = 6
Practice Set 24 | Q 1.10 | Page 47
Find the HCF of the following number.
150, 225
SOLUTION
Factors of 150: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150
Factors of 225: 1, 3, 5, 9, 15, 25, 45, 75, 225
Common factors of 150 and 225: 1, 3, 5, 15, 25, 75
? HCF of 150 and 225 = 75
Practice Set 24 | Q 2 | Page 47
If large square beds of equal size are to be made for planting vegetables on a plot of
land 18 meters long and 15 meters wide, what is the maximum possible length of each
bed?
SOLUTION
Length of the plot = 18 m
Breadth of the plot = 15 m
The maximum possible length of each square bed is the HCF of 18 m and 15 m.
Factors of 18 = 1, 2, 3, 6, 9, 18
Factors of 15 = 1, 3, 5, 15
Common factors of 18 and 15 = 1, 3
HCF of 18 and 15 = 3
? Maximum possible length of each square bed = 3 m
Thus, the maximum possible length of each square bed is 3 m.
Practice Set 24 | Q 3 | Page 47
Two ropes, one 8 meters long and the other 12 meters long are to be cut into pieces of
the same length. What will the maximum possible length of each piece be?
SOLUTION
Length of one rope = 8 m
Length of other rope = 12 m
The maximum possible length of each piece of rope of the same length that can be cut
from the two given ropes is the HCF of 8 m and 12 m.
Factors of 8: 1, 2, 4, 8
Factors of 12: 1, 2, 3, 4, 6, 12
Common factors of 8 and 12: 1, 2, 4
HCF of 8 and 12 = 4
? Maximum possible length of each piece of rope of same length = 4 m
Thus, the maximum possible length of each piece of rope is 4 m.
Practice Set 24 | Q 4 | Page 47
The number of students of Std 6th and Std 7th who went to visit the Tadoba Tiger
Project at Chandrapur was 140 and 196 respectively. The students of each class are to
be divided into groups of the same number of students. Each group can have a paid
guide. What is the maximum number of students there can be in each group ? Why do
you think each group should have the maximum possible number of students?
SOLUTION
Number of students of Std 6th = 140
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