Question

Reina and Sam are multiplying (84)5 (73)9.


Reina's Work Sam's Work
(84)5 (73)9 = 84 + 573 + 9 = 89712 (84)5 (73)9 = 84⋅573⋅9 = 820727

Is either of them correct? Explain your reasoning.

Answer 1

please help

Answer 2

Is the problem: 84 x 5 x 73 x 9 ?

Answer 3

yes

Answer 4

Reina's work: (84)5 (73)9 = 84 + 573 + 9 = 89712
Mistake #1: 5(73) = 5 x 73 and is not equal to 573
Mistake #2: (84)5 (73)9 = 84 x 5 x 73 x 9. Each number has to be multiplied and not added.
Mistake #3: 84 + 573 + 9 is not equal to 89712

Sam's work: (84)5 (73)9 = 84⋅573⋅9 = 820727
Mistake #1: 5(73) = 5 x 73 and is not equal to 573
Mistake #2: 84⋅573⋅9 is not equal to 89712

Both are wrong.