Correct, 16 minus 9 equals 7, Decompose 13 into 10 and 3., 17 minus 8 equals 9, Decompose 18 into 10 and 8., 15 minus 8 equals 7, Incorrect, 16 plus 9 equals 7., Decompose 19 into 10 and 7., 17 minus 8 equals 2, 12 equals 9 minus 3., Decompose 13 into 10 and 8.

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