Junior1965 Junior1965
  • 12-01-2017
  • Mathematics
contestada

Can you use doubling for 7 times 3

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Student2332
Student2332 Student2332
  • 12-01-2017
What do you mean doubling? You can add 7+7+7 which equals 21. 
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PrettyAwesomeSmart
PrettyAwesomeSmart PrettyAwesomeSmart
  • 12-01-2017
Well yea doubling is like getting the same number like 7×3 with equals 21
So you have to find the same number 21, but in a different way like this

   7
   7              7
 +7           ×3
------        -----
  21           21
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