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Best Answer

M - 9 = 11

so

M - 11 = 9

then, you complete this fact family by putting in the 2 addition problems:

9 + 11 = M

11 + 9 = M

then, you solve the problem:

11 + 9 = 20

therefore

M = 20

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14y ago
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Q: WHAT IS M-9 equals 11?
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