Dingding Jr. practices calligraphy. He must finish 25 Chinese characters. If he writes three Chinese characters every day, can he finish it in eight days? How to make a formula?

Analysis:

If you write three eight days a day, you can write 3×8 = 24.

24 is less than 25, so it can't be finished.

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.