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When you are adding and subtracting decimals, there are two key things you need to do:

1) Line up your decimal points.

2) Fill in the decimals places, so there are the same amount in each question.

 

 

e.g. 4.75 + 2.4

 

Step 1: Set up the addition, taking care to line up your decimal points and add extra zeros where needed.

4.75
+  2.40
 

 

Step 2: Complete the addition as normal.

4.75
+  2.40
7.15

 

 

e.g. 3.845 - 0.48

 

Step 1: Set up the subtraction, taking care to line up your decimal points and add extra zeros.

3.845
-  0.480
 

 

Step 2: Complete the subtraction as normal.

3.845
-  0.480
3.365

 

 

Before you start this activity, grab a pen and paper so you can write out your own addition and subtraction sums to work them out. 

10 questions