Multiplication with tenths.

I am learning to multiply a whole number by a decimal fraction.

Questions like 4 X 1.2 = ?

Three people have been given 1 whole chocolate bar and 2 tenths of a chocolate bar. How much chocolate is there in total? 3 X 1.2 = ?

chocolate

chocolate

chocolate

Step 1: We can work out how many whole chocolate bars there are by calculating 3 groups of 1 whole.

Step 2: Now work out how many tenths there are. 3 groups with 2 tenths in each. 3 X 0.2 = ? 0.6

3 X 1 = ? 3

Step 3: Add the two amounts together. 3 + 0.6 = 3.6

Six people have been given 0.6 of a chocolate bar. How much chocolate is that in total? 6 X 0.6 = ?

Step 1: There are six groups of 6 tenths.

Step 2: Now we need to work out what 36 tenths is the same as.

We know there are 10 tenths in a whole so in 36 there must be… 3 wholes and 6 left over.

6 X 6 tenths = ? 36 tenths

6 X 0.6 = 3.6

Now try these questions on your own. You may need some blocks to help you work these out.

Need some more practise? Try Teacher Tools Addition and Subtraction Book or Fractions, Decimals and Percentages Book Numeracy resources

1) 4 X 0.8 = ?

2) 3 X 1.2 = ?

3) 5 X 3.6 = ?

4) 6 X 2.4 = ?

5) 8 X 1.9 = ?

Click again when you have completed each question and the answer will be displayed.

3.2

3.6

18

14.4

15.2