Children in Grade One can use physical objects to guide their thinking when learning mathematics. For example, if 4 and 9 are bigger, you can take out 4 sticks and 9 sticks for your child to count. After removing four sticks respectively, four sticks are gone, while five sticks are left in nine, so 9 is greater than 4. Educators and teachers in lower grades should be patient enough to let children form perceptual thinking first, lay a good foundation, and then gradually increase the difficulty later.