Addition and Subtraction of Decimals

Today we looked at the addition and subtraction of decimals. This is very similar to the addition and subtraction of larger number, which should have been covered in primary school. If you are struggling with this or would like a refresher, the following websites are very handy.

Addition: http://www.mathsisfun.com/numbers/addition-column.html
Subtraction: http://www.mathsisfun.com/numbers/subtraction-regrouping.html

Adding and subtracting decimals is pretty much exactly the same as adding whole numbers. The key is to keep your working and setting out neat and tidy. When you write the numbers to add, be sure to line up your decimal points. You should also fill in any blank place values with zeros. Once you have done this you can simply add or subtract as you normally would. For example:

Again, some great websites for extra information on this, as well as some more examples can be found here

Addition of decimals: http://www.mathsisfun.com/adding-decimals.html
Subtraction of decimals: http://www.mathsisfun.com/subtracting-decimals.html

As far as work goes, in class we looked at section 4.4 of our booklets. We are working through the following questions:
1 and 2 -> first column of each
4, 5, 8, 10, 11, 15
Note that questions 10, 11 and 15 are more advanced questions, however all students should be able to complete up to and including question 8. If you are missing your booklet or would like further worksheets, I have included some links to further worksheets under the "Worksheets" tab.

If you have any questions or comments regarding this topic feel free to comment on here and I will get back to you.