The skill taught is how to solve subtraction problems with a missing subtrahend by adjusting from a known fact to reach the desired difference.
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Subtraction with missing values
Test your understanding of subtraction with missing values by practicing it! Work through the below exercises to use it in practice.
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30 minus what number would equal 23?
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We know that 30 minus 10 would equal 20
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But we don't want to go quite that far, we only need to get down to 23, so let's subtract 3 less than 10.
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30 minus 7 would equal 23.