6 + 8 = 6 + 4 + 4 = 10 + 4 = 14;
70 − 1 = (60 + 10) − 1 = 60 + (10 − 1) = 60 + 9 = 69;
56 − 35 = (50 + 6) − (30 + 5) = (50 − 30) + (6 − 5) = 20 + 1 = 21;
9 + 6 = 9 + 1 + 5 = 10 + 5 = 15;
62 − 40 = (60 + 2) − 40 = (60 − 40) + 2 = 20 + 2 = 22;
82 − 61 = (80 + 2) − (60 + 1) = (80 − 60) + (2 − 1) = 20 + 1 = 21;
45 − 30 = (40 + 5) − 30 = (40 − 30) + 5 = 10 + 5 = 15;
28 − 14 = (20 + 8) − (10 + 4) = (20 − 10) + (8 − 4) = 10 + 4 = 14;
32 + 37 = (30 + 30) + (2 + 7) = 60 + 9 = 69;
48 − 26 = (40 + 8) − (20 + 6) = (40 − 20) + (8 − 6) = 20 + 2 = 22.
Верные равенства:
6 + 8 = 28 − 14;
70 − 1 = 32 + 37;
56 − 35 = 82 − 61;
9 + 6 = 45 − 30;
62 − 40 = 48 − 26.