My childs teacher marked 10 and 11 wrong? But I think my child choose the right answer. What do you think?

Question

asked Feb 24, 2019 172k views

1 Answer

Ldlchina · Answer 1 · 2019-03-02T03:17:12+0000

commutative property of addition a+b=b+a

Choice D

53+9 = 9+53

11. 1st week: 345 bought lunch

2nd week :345-23= 322 bought lunch

total in 1st two weeks 345+322 = 667

Choice C