45 − 18 = 27; 90 − 52 = 38; 35 : 1 = 35; 65 − 37 = 28.
51 − 17 = 34; 34 + 26 = 60; 14 : 14 = 1; 72 − 26 = 46.
81 − 49 = 32; 72 : 8 = 9; 36 − 24 = 12; 50 − 15 = 35.
60 − 29 = 31; 35 + 35 = 70; 30 · 0 = 0; 97 − 38 = 59.
56 : 7 = 8; 63 − 45 = 18; 46 + 19 = 65; 63 : 1 = 63.