Question

( 1207 + 1021 ) + ____ = 1207 + ( 1221 + 1021 )​

Answer 1

Answer:

1221

Step-by-step explanation:

(a+b)+c = a+(b+c)

(1207+1021)+1221= 1207+(1221+1021)

Answer 2

Answer:

(1207 + 1021) + 1221 = 1207 + (1221 + 1021)

Step-by-step explanation:

Associative property of Addition.

(a + b) + c = a +( b + c)

Verification:

(1207 + 1021) + 1221 = 1207 + (1221 + 1021)

2228 + 1221 = 1207 + 2242

3449 = 3449

Hence, verified.

Hope it helps you..!