2, but when children are unfamiliar with their backs, they can use intuitive operations to help them remember. The method is simple. I learned it in the game. I played some counting games from the beginning to let him know what is addition and what is subtraction in the game.

3. Play with friends so that they can easily find several groups of complementary numbers, such as 1 and 9, 2 and 8.

4. Finally, buying and selling things to find money. In the game, teach him to calculate with a familiar group of friends, such as 8+5, so that he can break 8 into 5+3, because 5 needs to find its friends 5, 5+5 = 10, leaving 3, 10+3 = 13. Similarly, you can also split 5 into 2+3. What about subtraction? For example, 1 1-4, let him divide 1 1 into 10+ 10-4=6, leaving the next 1, 6+65438+ Too many games, too fast calculation.