3 years ago

How can 400x20 help solve 399x20

Mathematics

2 answers:

jeka57 [31]3 years ago

7 0

Just subtract 20 from the answer of 400x20. One number less.

Dvinal [7]3 years ago

5 0

What you can do is multiply 400*20= 8,000. From here, we know that 399*20 is just one less group of 20 than 400. Therefore, we can subtract (1*20) from 8,000 to get the final answer.

8000-20=7980

Hope this helps!

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