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The sum of 21 and a number is 30

The sum of 21 and a number is 30
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5 votes
The sum of 21 and a number is 30

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User Mytheral
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8.4k points

1 Answer

3 votes
Hi!

Use the opposite operation to solve: (Subtraction)

30 - 21 = 9

So, the sum of 21 and 9 is 30.
answered
User Liza Daly
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8.6k points
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