The addition and subtraction of children's mathematics enlightenment methods within 20 days can start from integers, such as 10+ 10=20,1+9 = 20, 12+8=20. From now on, the first addend adds 1 and the last addend subtracts 1, and the result is the same. What is subtraction? For example, 19-8= 1 1,18-7 =1,17-6 =1. This is also the case. In addition, children can learn mental arithmetic slowly. This problem is simply solved.

Abacus mental arithmetic shows that children need to form an abacus mental arithmetic in their brains and empty it to get the answer. Abacus mental arithmetic is mechanical memory, relying on rote memorization and training accumulation. Practice makes perfect. Will limit the child's brain development. Primary school mathematics is to let children understand mathematics and solve problems, and rote learning is not recommended. Abacus mental arithmetic does not have the concept of logarithm, but starts from a high position, while mathematics education in primary schools starts from a low position. The conflict of teaching methods will confuse children.