1. See whether there are digits (single digits, tens digits, hundreds digits, etc.) from the single digits of a number. ) is divisible by 5.

2. If yes, just change the number to 5 and move on to the next number.

3. If not, directly round the single digit to the nearest digit (ten digits).

4. Add 1 to the rounded decimal place, and then round it to get a result approximately equal to.

The rule that the number is approximately equal to

In mathematics, the relationship between similar values is expressed by equations. Equality is expressed by an equal sign, written as "material" and read as "about equality".

Chinese name: Deng Yue.

Symbol: Write ""

Reading: reading "about equal to"

Meaning: It means that the relationship between similar values is expressed by about, etc.

Concept: In mathematics, the relationship between similar values (exact value and approximate value) is expressed by approximation.

About equality is a rough estimate. For example, it's about a mile from A to B, about half a kilometer. The number A is roughly equal to the number B, and I'm as heavy as you. It is approximately equal to an unknown number. Equivalence is a definite number, such as one: one equals two, and five times six equals thirty, which will not change. About equal to about how much, I don't know.

The general rule that a number is approximately equal to the decimal point is rounding. Generally speaking, it is necessary to determine which digit is accurate to the decimal point (there are also integer digits). For example, if a number is required to be accurate to two digits after the decimal point, then if the number is greater than 5, you need to add 1 to the second digit after the decimal point and leave it behind, keeping the original second digit. It has nothing to do with the third digit after the decimal point. For example, 15.342 ... is approximately equal to 15.34, 15.346 ... is approximately equal to 15.35.