eager2learn eager2learn
  • 27-09-2016
  • Mathematics
contestada

explain how using basic facts can help you find 10 X 20 X 30 X 40 mentally?

Respuesta :

JeffBuckley JeffBuckley
  • 27-09-2016
Take the left side of each number first. Do 1 x 2 x 3 x 4. That equals 24. Easy. Now, count the 0's in the equation which are 4 of them. Add the four zeros and to the 24 and that's your answer. 240,000
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siyake480
siyake480 siyake480
  • 27-09-2016
First you o 10*20 which is 200. Then multiply it by 30 that equals to 6000. And then multiply it by 40 that is 240,000.
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