How to subtract this question 91.49-0.7

We can start by leaving the 9 in the hundreths place alone as this is not affected. We can then subtract 7 from 4 for the tenths place. This gives - 3. As this is a negative number, we need to subtract 1 from the next place (the units) and then take another 3 from the tenths place. This gives us an answer of 90.79 (where both the 9's are unaffected).

1. Line up the decimals

2. Subtract normally as if there were no decimals

3. Move the decimal directly down.

The answer is 90.79