50 − 12 = 38; 70 + 28 = 98; 66 − 41 = 25; 62 + 25 = 87; 89 − 56 = 33.
100 − 47 = 53; 90 − 41 = 49; 38 + 21 = 59; 49 − 15 = 34; 21 + 17 = 38.
80 − 56 = 24; 80 − 57 = 23; 73 + 24 = 97; 86 − 52 = 34; 62 + 26 = 88.
70 + 12 = 82; 100 − 33 = 67; 98 − 67 = 31; 84 + 12 = 96; 29 − 18 = 11.
40 + 35 = 75; 30 + 54 = 84; 37 − 13 = 24; 21 + 78 = 99; 39 − 12 = 27.
60 + 32 = 92; 90 − 44 = 46; 65 + 24 = 89; 39 − 17 = 22; 38 + 41 = 79.