The greater than sign looks like the shape formed by the thumb and forefinger of the right hand, so we can tell children that the greater than sign is hidden in the right hand. When a child wants to tell whether it is larger than the size, he just needs to stretch out his right hand and compare it.

Comparison of integer sizes:

1, look at the digits first, there are many digits.

For example, 100 is greater than 20, because 100 has 3 digits, while 20 has only 2 digits.

2. The digits are the same. Starting from the highest digit, the number in the same digit is larger.

For example, if 320 is greater than 3 10, the digits are the same, and the highest hundred digits are all 3, then we will look at the next ten digits. The decimal digit of 320 is 23 10, and the decimal digit of 320 is 1, 2 > 1, so 320 is greater than 3 10.