SChand New Learning Composite Mathematics Class 6 Chapter 2 Whole Numbers Exercise 2A

Exercise 2A

Question 1

(a) 5 + 9 = 14

9 + 5 = 14

Commutative Property.

Question 2

495 – 0 = 495

Property of zero.

(c) 7+(4+9) = 7 + 13 = 20

(7 + 4) + 9 = 11 + 9 = 20

Associative property.

Question 3

(a) Commutative property.

(b) Additive Property.

(c) Associative Property.

(d) Commutative Property.

Question 6

(a) 8 + 23 + 2 = 23 + 8 + 2 [Commutative property]

= 23 + (8 + 2) [Associative Property]

= 23 + 10

= 33

(b) 17 + 29 + 3 = 29 + 17 + 3 [Commutative Property]

= 29 + (17 + 3) [Associative Property]

= 29 + 20

= 49

(c) 16 + 47 + 14 = 16 + 14 + 47 [Commutative Property]

16 + (14 + 47) [Associative Property]

= 16 + 61

= 77

(d) 33 + 48 + 7 = 7 + 33 + 48 [Commutative Property]

= 7 + (33 + 48)

= 7 + 81

= 88

(e) 20 + (63 + 80)

= 20 + 143

= 163

(f) 8 + 13 + 7 + 12 = 8 + 7 13 + 12 [Commutative]

= (8 + 7) + (13 + 12) [Associative]

= 15 + 25

Question 7

(a) 869 + 73 + 237 + 31

= 869 + 31 + 73 + 237 [Commutative]

= (869 + 31) + (73 + 237) [Associative]

= 900 + 310

= 1210

(b) 916 + 425 + 584 + 315

= 916 + 584 + 425 + 315 [Commutative]

= (916 + 584) + (425 + 315) [Associative]

= 1500 + 740

= 2240

(c) 1756 + 683 + 1244 + 517

= (1756 + 1244) + (683 + 517) [Commutative]

= 3000 + 1200 [Associative]

= 4200