Find the missing number in the given equation. 18−9=10− ____ =9
A
9
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B
8
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C
18
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D
1
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Solution
The correct option is D1 The given equation can be completed as shown in the following image: ∙ First, we decompose 9 into 8 and 1. ∙ We then subtract 8 from 18 to get 10. ∙ Finally, we subtract 1 from 10 to get 9.