How do you round 21.3528 to the nearest tenth?

Step 1. I look in the hundredths place. If I see a 5 or more I round up, otherwise down, to the next multiple of one tenth.

Step 2. The number in the hundredths place is 5 so I know to round up.

Step 3. The next higher multiple of one tenth is 21.4. That is the answer.