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EXERCISE 6.3, HW, 17/012022, 4. Add or subtract., 2., cm, cm, 1., 3., 2 4., cm, 40, 50 o), 35, 88, -30, + 20, 26 odd, + 35, B. Find the sum., 1., cm, 3., cm, cm, 21 25, 54 10, 62 45, + 64, 55, + 17 55, + 24 75, C. Find the difference., 1., m, cm, cm, m, cm, 76 55, 64 20, 62 30, 44 75, 35 70, 51 85, -, o mo, 3., 2., 2.