2. Calculate n plus 1. Any child who can count in turn and understand that it means to increase 1 can easily learn to calculate n plus 1, including 10 plus 1, 20 plus 1, 99 plus 1, and even 65438.
3. Calculate N minus 1. Any child who can count backwards and understand the meaning of minus 1 can learn to calculate N minus 1, including 1/kloc-0 minus 1, 2/kloc-0 minus 1 and/kloc-0.
4. Addition and subtraction of integer 10, such as 10 plus 10, 20 plus 10, ... 90 plus 10. Children who can count every 10 and understand its meaning are eager to learn.
Learn addition and subtraction skills:
1, practice the operation in 10, which is the basis of carry abdication operation. The operation within 10 is easy to make clear, otherwise the operation after 10 will be very chaotic.
2. Let children know the structure of two digits, and distinguish between "ten digits" and "unit digits", such as "14", including a "10" and a "4", especially the "1" of ten digits, and understand that it stands for "/kloc-0".
3. The operation of two digits is suitable for the combination of "horizontal" and "vertical". The relationship between vertical ten digits and unit digits is more obvious. Instead of telling these "terms" to children, let them understand them through sensibility.
4. If the child has difficulty in operation, provide small items for the child to operate while playing. For example, 14 MINUS 5 is not counted, so let the children take 14 broad beans to assist in the operation. Preschool children have very specific thinking. Letting children use "crutches" as needed helps to improve their operational ability.