Primary school grade 1 will not add or subtract within 10 how to do My family's children can't do addition and subtraction within 10 even though they are in Grade 1. What should I do if I have to pull my fingers

Primary school grade 1 will not add or subtract within 10 how to do My family's children can't do addition and subtraction within 10 even though they are in Grade 1. What should I do if I have to pull my fingers

Spanner means that he doesn't understand subtraction. You can find some real objects for him to practice
For example: using chopsticks to calculate addition and subtraction, playing cards, toys, etc