Question

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

Answer 1

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