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1) 68 – 14 = 54; 68 – 17 = 51; 51 • 3 = 153; 17 • 13 = 221. 2) 7 • 5 = 35; 77 – 35 = 42; 210 : 42 = 5; 77 – 38 = 39.
1) 68 – 14 = 54; 68 – 17 = 51; 51 • 3 = 153; 17 • 13 = 221. 2) 7 • 5 = 35; 77 – 35 = 42; 210 : 42 = 5; 77 – 38 = 39.