Question

question How does knowing the fact 6x5 help you find the answer to 500x60? Maria answered, I know 6x5 is 30. Now all I have to do is count the zeros and I get 3000 use place value understanding to explain why her answer is wrong

Answer 1

We have that 6*5 = 30

It helps finding 500*60 because we can remove the 3 zeros, and them add them after the multiplication. So

500*60:

5*6 = 30

Adding the 3 zeros

30000

Maria forgot to add one zero. There is the 30 from 6*5, and three extra zeros that were removed before. Maria only added 2 of them, thinking it was 3 total zeros.