"13 ______ 4 equals 9.", equal, plus, minus, "17 minus 9 ______ 8.", decompose, equals, minus, "Our group has 13 pupils. There are 7 girls. How many boys?", 6 boys, 7 boys, 5 boys, "Decompose 16 into ______ and 6.", 8, 10, 9, "14 minus 6 equals ______.", 8, 7, 9, "Which sentence is incorrect?", 15 minus 8 equals 7., 15 minus 7 equals 7., Decompose 16 into10 and 6.

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