The decomposition and synthesis of 6 is a knowledge point in the addition and subtraction of numbers within 10 in the first grade mathematics of People's Education Press. The decomposition and composition of 6 can be illustrated by the demonstration of wooden sticks, so that the first-grade children can understand that 6 can be decomposed into 1 and 5, 2 and 4, 0 and 6, 3 and 3, and vice versa, 1 and 5, 2 and 4, 0 and 6, 3 and 3 can form 6.

The decomposition of 8 is: 1 and 7, 2 and 6, 3 and 5, 4 and 4, 5 and 3, 6 and 2, 7 and 1 = 7,8-2 = 6,8-3 = 5,8-4 =

The composition of 8 is 1 and 7, 2 and 6, 3 and 5, 4 and 4, 5 and 3, 6 and 2, 7 and 1. Expressed by the formula: 1+7=8, 2+6 = 8, 3+5=8, 4+4=8, 5+3=8.