Decimal addition and subtraction

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free digit if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Fill in the answers to these sums. You will probably find it easier to calculate them with pen and paper first. If you are preparing for the Adult Numeracy test do not use a calculator as calculators are not allowed in the test. If you are studying Functional Skills you may use your calculator but check your answer is sensible by doing an approximation before you enter it.

Addition

40.8 + 2.35 =

9.6 + 0.25 =

3.2 + 0.902 =

8 + 9.99 =

0.527 + 2.85 =

A label on a bottle of water states there is 0.035 g of calcium and 0.105 g of bicarbonate. What is their total weight? g

Subtraction

8.12 - 3.76 =

14.76 - 2.3 =

214 - 3.5 =

14 - 0.375 =

2.001 - 1.936 =

What is the difference between 7.4 and 13.1?

Find the difference between 4.125 and 9.

At the start of a science experiment, a scale showed 0.302 g. At the end of the experiment the scale showed 0.32 g. By how much has the weight increased? g

A tablet weighs 1 g. It contains 0.05 g of salt. What is the weight of the other ingredients? g