Step by step
The question
Question: round 21 to the nearest ten.
Round 21 to the nearest ten
1 Find the two tens
2 Find the closer one
21 is closer to 20.
So 21 rounded to the nearest ten is 20.
The sign ≈ means about.
= 21 ≈ 20
3 Check
We check with the digits.
The next digit after the tens is 1.
4 or less rounds down.
Yes!
It works.
tens digit 2, next digit 1: 4 or less → down
Let's look back.
First: find the two tens.
Then: find the closer one.
Last: check.
Answer
= 21 ≈ 20