15. 1) 27 + 4 42 – 6 83 – 9 15 + 8 64 – 7 21 – 5 5 + 48 7 + 93 2) 82 – 7 63 – 6 94 – 6 52 – 8 73 – 7 96 – 8 84 – 7 56 – 9

1) Решим примеры:

• $$27 + 4 = 31$$
• $$42 - 6 = 36$$
• $$83 - 9 = 74$$
• $$15 + 8 = 23$$
• $$64 - 7 = 57$$
• $$21 - 5 = 16$$
• $$5 + 48 = 53$$
• $$7 + 93 = 100$$

2) Решим примеры:

• $$82 - 7 = 75$$
• $$63 - 6 = 57$$
• $$94 - 6 = 88$$
• $$52 - 8 = 44$$
• $$73 - 7 = 66$$
• $$96 - 8 = 88$$
• $$84 - 7 = 77$$
• $$56 - 9 = 47$$