Correct: 7 + 3 = 10, 6 + 4 = 10, 12 + 8 = 20, 17 + 3 = 20, 19 + 1 = 20, 9 + 1 = 10, 2 + 8 = 10, 19 + 1= 20,  5 + 15 = 20, 16 + 4 = 20, Incorrect: 7 + 2 = 10, 17 + 2 = 20, 5 + 17 = 20, 3 + 8 = 10, 4 + 8 = 20, 18 + 1 = 20, 20 + 1 = 20, 13 + 5 = 20,

Bondiau rhif/number bonds

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