What is the difference when subtracting 0.2 from 0.9?

To find the difference when subtracting 0.2 from 0.9, you need to perform the calculation: 0.9 - 0.2. When you carry out this operation, you start by lining up the numbers based on their decimal points.

Subtracting 0.2 from 0.9 means you take 0.2 away from 0.9. In decimal terms, 0.9 can be thought of as 9 tenths, and 0.2 as 2 tenths. When you take 2 tenths away from 9 tenths, you are left with 7 tenths, which is written as 0.7.

Therefore, the correct answer is 0.7 because it accurately represents the result of the subtraction. This understanding of borrowing in decimal subtraction is crucial, and recognizing how decimal numbers work reinforces numerical skills.