How many Ones do we need to add to 21 to get the correct answer for 21 – 9 using compensation strategy? Identify the correct answer.

8 Ones, 12

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6 Ones, 14

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1 Ones, 20

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7 Ones, 13

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Solution

The correct option is A 8 Ones, 12
Let us solve 21 – 9 using compensation strategy.

Therefore, based on the above solution, we can conclude that we need to add 8 Ones to 21 to get the correct answer for 21 – 9 using the compensation strategy. 12 is the correct answer for 21 – 9.

Hence, Option C is correct.

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