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\ 19-Nov-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

Exercise 2A

1. Add the following consecutive numbers and find the sum mentally without proper
addition.

a. 91 + 92 + 93 + 94 + 95
b. 87 + 88 + 89 + 90 + 91 + 92 + 93
c. 108 + 109 + 110 + 111 + 112 + 113 + 114 + 115 + 116

d. 875 + 876 + 877 + 878
e. 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26

2. use the properties of addition to fill in the blanks.

a. 4326 + 26458 = _______ + 4326 b. _______ + 71,364 = 71364 + 436483

c. 56436 + _______ = 56436 d. _______ + 364834 = 364834

3. Add:
a. 6 7 8 9 8 7 b. 7 6 5 4 3 2 c. 8 9 8 9 7 6

+ 8 7 6 5 6 + 9 8 7 6 5 1 + 5 6 5 6 5

d. 7 9 8 0 0 3 7 e. 2 8 6 9 7 3 f. 8 7 5 0 3 4
+ 6 7 8 9 8 7 1 7 6 9 5 6 3 1 5 6 8 2
+ 2 9 8 7 6 5 + 4 5 6 7 8 9

4. Arrange the following numbers in columns and then add.

a. 49378 and 52480 b. 432646 and 5343 c. 449458 and 67248

d. 548364 and 873426 e. 243649, 53736 and 4969 f. 14364, 132403 and 248364

5. find the missing digits.

a. 5 4 6 b. 6 3 4 3 6 8 c. 7 2 6 4 3 8

+ 3 8 2 + 9 4 + 5 4 8
1 1 2 0 6 8 7 3 9 8 1

d. 7 4 3 6 e. 5 6 4 3 6 f. 7 3 6

+ 1 5 4 3 4 + 6 2 3 9 + 4 6 2
6 9 8 1 5 8 6 3 7 3 6

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Mathematical Operations