1.

Mark true or false.(a) (100 + 10) + 5 = 100 + (10 + 5) ____(b) 100 − (10 − 5) = (100 − 10) − 5 ____(c) (72 − 36) − 20 = 72 − (36 − 20) ____(d) (68 × 4) × 20 = 68 × (4 × 20) ____(e) 7(6 − 3) = 7 × 6 − 7 × 3 ____(f) 20 × 30 = 30 × 20 ____(g) 87 − 41 = 41 − 87 ____(h) 16 × 4 = 4 × 16 ____(i) 480 + 0 = 0 + 480 ____(j) (16 + 7) + 3 = 16 + (7 + 3) ____

Answer» Mark true or false.

(a) (100 + 10) + 5 = 100 + (10 + 5) ____

(b) 100 − (10 − 5) = (100 − 10) − 5 ____

(c) (72 − 36) − 20 = 72 − (36 − 20) ____

(d) (68 × 4) × 20 = 68 × (4 × 20) ____

(e) 7(6 − 3) = 7 × 6 − 7 × 3 ____

(f) 20 × 30 = 30 × 20 ____

(g) 87 − 41 = 41 − 87 ____

(h) 16 × 4 = 4 × 16 ____

(i) 480 + 0 = 0 + 480 ____

(j) (16 + 7) + 3 = 16 + (7 + 3) ____


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