For example, one, ten, one hundred, one thousand, ten thousand, one hundred thousand and so on. It is called the counting unit of numbers.

The counting unit of a fraction is "a fraction of the denominator", for example, the counting unit of 3/8 is 1/8.

Percentages are counted in 1%.

Counting time unit:

1 sec = 1000 ms

1 min =60 seconds

1 hour =60 minutes

1 day =24 hours

Parents are advised to teach their children more, remind them when they can't remember, and remember when they say more.

Of course, you can also post some educational stickers on your home wall, such as the 99 multiplication table (for example).