1. Do subtraction and want to add. Do the inverse of addition with subtraction and think with addition. For example, 12-8 and Xiang 8+( )= 12.
2. Violation of the Ten Laws. You can think of it this way: 10-7+3=6.
3. Continuous subtraction (common method). With continuous subtraction, you can think like this: 13-3-4=6, which means dividing 7 by 3 and 4.
4. Supplementary methods. You can also think like this: 13- 10+3=6.
5. Recite ten songs:
19 19 years of good friends,
Hand in hand,
3737 is so close,
Let's go together, four, four, six, six,
Make a pair of hands in half.
6. Interesting calculation:
Computing is a boring learning activity. In order to improve students' interest in calculation, some interesting calculation questions can be added to cultivate students' interest in calculation. Such as: find the law, swing the match with simple calculation to make the equation hold, and find a partner to compete.