Before we find the exact difference, we can make an estimate by rounding the given numbers. We will round 4.5 to 5 because it is the closest whole number.
45-5=40The difference between 45 and 4.5 is about 5. To subtract decimals, we line up the decimal points so that place-value positions correspond. Annex zeros so that each place has a digit.
Now we subtract the decimals just as we would with whole numbers and place the decimal point in the answer.
Our answer 40.5 is really close to our estimation!
