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5 votes
Can you use doubling for 7 times 3

2 Answers

3 votes
What do you mean doubling? You can add 7+7+7 which equals 21. 
User Trauer
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7 votes
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
User Reallyethical
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8.0k points

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