1. 1×1 = 1
2. 2×2 = 4
3. 7×7 = 49
4. 13×11 = 143
5. 87×55 = 4,785
1. 790+680 = 1,470
2. 1,580+3,290 = 4,870
3. 3,630+2,520 = 6,150
4. 17,526+33,799 = 51,325
5. 16,801+24,252 = 41,053
1. 2-3 = -1
2. 63-39 = 24
3. 51,503-77,297 = -25,794
4. 60,189-4,430 = 55,759
5. 117,288-63,199 = 54,089
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