tberg8634
tberg8634
17-09-2017
Mathematics
contestada
how can 400x20 help solve 399x20
Respuesta :
kphung76127
kphung76127
17-09-2017
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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Alexals342
Alexals342
17-09-2017
Just subtract 20 from the answer of 400x20. One number less.
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