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Learn the skill
Use equal-sized pieces from the same whole. Subtract their counts, not their denominators. Keep any extra whole: a remainder can exceed one whole or equal zero. Check by adding the remaining amount to the removed amount.
Worked example
7/8 - 3/8 = 4/8 = 1/2. Seven eighth-size pieces start aboard; three leave and four stay. Check: 4/8 + 3/8 = 7/8. The picture shows this example, not the questions.