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  • 25-10-2018
  • Mathematics
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My childs teacher marked 10 and 11 wrong? But I think my child choose the right answer. What do you think?

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

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wegnerkolmp2741o
wegnerkolmp2741o wegnerkolmp2741o
  • 25-10-2018

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

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