True: 7 × 7=49, 6 × 6= 36, 66 × 2= 132, 67-45=22, 54- 56 = - 2, False: 7 × 7= 48, 8× 8 = 65, 71 × 2= 143, 68- 109 = 41, 5× 10 = 75,

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