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Steps to calculate predecessor
Ques 1: Predecessor of:
(a) 2340 is __________
(b) 25621 is __________
Ans: (a) 2339
(b) 25620
Steps to calculate successor
Ques 2: Successor of:
(a) 21029 is __________
(b) 7810 is __________
Ans: (a) 21030
(b) 7811
Ques 3: Match the following:
(i) Predecessor of smallest 5digit number  (a) 100000 
(ii) Successor of largest 5digit number  (b) 1000 
(iii) Successor of largest 3digit even number  (c) 9999 
(iv) Predecessor of smallest 4digit odd number  (d) 999 
Ans.
(i) ↔ (c)
(ii) ↔ (a)
(iii) ↔ (d)
(iv) ↔ (b)
Ques 4: A boy is moving from one tree to another find the position of the boy from number line?
(i)
(ii)
(iii)
Ans: (i) Position of boy is 7 units (4 + 3 = 7)
(ii) Position of boy is 9 – 3 = 6 units
(iii) Position of boy is 4 × 3 = 12 units
Ques 5: Represent the following on a number line:
(i) 5 + 3
(ii) 10 – 6
(iii) 2 × 5
Ans.
(i)
(ii)
(iii)
Ques 6: Simplify by using suitable rearrangement:
(i) 417 + 225 + 583
(ii) 4 × 537 × 25
(iii) 8212 + 284 + 788 + 716
(iv) 125 × 4 + 125 × 8
Ans: (i) 1,225
(ii) 53,700
(iii) 10,000
(iv) 1,500
Ques 7: Find the value of following using suitable properties:
(i) 437 × 102
(ii) 925 × 99
(iii) 143 × 22 + 143 × 8
(iv) 12345 × 15 – 2469 × 25
(v) 92785 × 98 + 92785 × 2
Ans: (i) 44,574
(ii) 91,575
(iii) 4,290
(iv) 1,23,450
(v) 92,78,500
Ques 8: Write the smallest 3digit number which will not change on reversing the digits.
Ans: 101
Ques 9: The difference of smallest 3digit number and its predecessor is __________.
Ans: 1
Ques 10: Write 'True' or 'False' for the following statements:
(i) The product of two odd numbers is always odd.
(ii) The product of two even numbers is always even.
(iii) The sum of two odd numbers is always odd.
(iv) The difference of one even and an odd number is always even.
(v) The difference of two odd numbers is always even.
Ans: (i) True
(ii) True
(iii) False
(iv) False
(v) True
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