The math skill being taught is how to find a missing fraction when you are given a part of the sum and the total sum. This entails identifying the needed fractional addition and checking for any required whole number adjustment.
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Fraction addition with missing value
Test your understanding of fraction addition with missing value by practicing it! Work through the below exercises to use it in practice.
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What fraction can we add to 1 seventh to get a sum of 2 and 3 sevenths?
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Let's look at the fractional part first. Our sum has 3 sevenths, and we're adding 1 seventh, so we know that we need to start with 2 sevenths.
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Now, since there was no carry in the addition of the fractions, we know that our whole needs to be a 2
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So 2 and 2 sevenths, plus 1 seventh, gives a sum of 2 and 3 sevenths