potatoface53 potatoface53

24-01-2020
Mathematics

contestada

please help

Sandra used partial products to find the product of 438 x 17 by multiplying 438 by 1 and 438 by 7 to get 3,066.Is Sandra correct? Compare your answer to Sandra's and explain why it is or is not the same.

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andrew8253 andrew8253

31-01-2020

Answer:

No, Sandra is not correct.

Step-by-step explanation:

Sandra was needed to multiply 438 by 17.

[tex]438\times17 = 438\times(10 + 7) = 438\times10 + 438\times7 = 4380 + 3066 = 7446[/tex].

17 = 10 + 7.

Sandra multiplied 438 by 1 and then multiplied 438 by 7. Sandra had taken [tex]438\times7 = 3066[/tex] as the answer.

Multiplying by 1 and multiplying by 10 is not same.

Sandra mistakenly multiplied 438 by 1 instead of 10.

Hence, Sandra got the wrong answer.

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