Math inspection: who is right?
decide which student simplified each expression correctly. then show
how you know that answer is correct.
1. lee said that 4(3-1) is 11. rae disagreed and said that the answer
was 8. who is right? how do you know?
2. jay said that 5(7 + 3) is 50. matt disagreed and said that the answer
was 38. who is right? how do you know?
3. stu said that 6(4-1) + 7 is the same as 6(10). joe disagreed and
said that 6(4-1) + 7 is the same as 6(3) + 7. liam claimed that
6(4-1) + 7 is the same as 6(4)-1 + 7. who is right? how do you
know?
4. may claimed that 5+3 x 7 is 56. don disagreed and said that the
answer was 26. who is right? how do you know?
5. chen said that 10 - 8 + 2 is 1. juan disagreed and said that the
answer was 6. who is right? how do you know?
6. meg said that 3(7 + 4) - 3(2 + 3) is the same as 25 - 9. mike dis-
agreed and said that 3(7 + 4) - 3(2+3) is the same as 3(11-5).
roy claimed that 3(7 + 4) - 3(2+3) is the same as 3(11 - 6 + 3).
who is right? how do you know?