Q1. What is 36 × 7?
(a) 242
(b) 252
(c) 246
(d) 232
Ans: (b) 252
Q2. If one pen costs ₹28, what will be the cost of 15 pens?
(a) ₹320
(b) ₹420
(c) ₹390
(d) ₹280
Ans: (b) ₹420
Q3. 125 × 20 = ?
(a) 2000
(b) 2250
(c) 2500
(d) 3000
Ans: (c) 2500
Q4. A box has 48 chocolates. How many chocolates are there in 25 boxes?
(a) 1000
(b) 1200
(c) 1100
(d) 1250
Ans: (b) 1200
Q5. 1001 × 9 = ?
(a) 9009
(b) 9090
(c) 9910
(d) 9100
Ans: (a) 9009
Q6. If a student reads 45 pages every day, how many pages will he read in 31 days?
(a) 1395
(b) 1385
(c) 1405
(d) 1415
Ans: (a) 1395
Q7. Multiplying by 10, 100, 1000
a) 5 × 10 = _____
b) 30 × 20 = _____
c) 10 × 600 = _____
d) 40 × 10 = _____
e) 25 × 1000 = _____
Sol: Quick trick:
Multiplying by 10 → add one zero.
Multiplying by 100 → add two zeros.
Multiplying by 1000 → add three zeros.
a) 5 × 10 = 50
b) 30 × 20 = 600
c) 10 × 600 = 6000
d) 40 × 10 = 400
e) 25 × 1000 = 25000
Q8. Find the products using the nearest multiple of 10:
1) 7 × 52
Sol: Take 52 = 50 + 2
7 × 52 = 7 × (50 + 2)
= (7 × 50) + (7 × 2)
= 350 + 14 = 364
2) 12 × 28
Sol: Take 28 = 30 – 2
12 × 28 = 12 × (30 – 2)
= (12 × 30) – (12 × 2)
= 360 – 24 = 336
3) 75 × 31
Sol: Take 31 = 30 + 1
75 × 31 = 75 × (30 + 1)
= (75 × 30) + (75 × 1)
= 2250 + 75 = 2325
Q9. Multiply the following
(a) 347 by 3
Sol:
(b) 411 by 31
Sol:
(c) 573 by 46
Sol:
(d) 123 by 456.
Sol:
Q10. Observe and Complete the Pattern:
(a) 2 × 5 = 10
20 × 5 = 100
200 × 5 = ?
2000 × 5 = ?
Sol:
2 × 5 = 10
20 × 5 = 100
200 × 5 = 1000
2000 × 5 = 10,000
Answer: 200 × 5 = 1000, 2000 × 5 = 10,000
(b) 2 × 3 = 6
22 × 3 = 66
222 × 3 = 666
2222 × 3 = ?
Sol:
2 × 3 = 6
22 × 3 = 66
222 × 3 = 666
2222 × 3 = 6666
Answer: 2222 × 3 = 6666
(c) 1 × 1 = 1
11 × 11 = 121
111 × 111 = 12321
1111 × 1111 = ?
Sol:
1 × 1 = 1
11 × 11 = 121
111 × 111 = 12321
1111 × 1111 = 1234321
Answer: 1111 × 1111 = 1234321
(d) 2 × 2 = 4
22 × 22 = 484
222 × 222 = 49284
2222 × 2222 = ?
Sol:
2 × 2 = 4
22 × 22 = 484
222 × 222 = 49284
2222 × 2222 = 4937284
Answer: 2222 × 2222 = 4937284
35 videos|318 docs|7 tests
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2. How is milk produced on a dairy farm? | ![]() |
3. What is the importance of dairy farming in agriculture? | ![]() |
4. What are the common breeds of dairy cows and their characteristics? | ![]() |
5. What measures are taken to ensure the health and welfare of dairy cows? | ![]() |