Multiplication with tenths.

1
Multiplication with tenths.
I am learning to multiply a whole number by a
decimal fraction.
Questions like 4 X 1.2 ?
2
chocolate
chocolate
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
Step 1 We can work out how many whole chocolate
bars there are by calculating 3 groups of 1 whole.
3 X 1 ?
3
Step 2 Now work out how many tenths there are. 3
groups with 2 tenths in each.
3 X 0.2 ?
0.6
3 0.6 3.6
Step 3 Add the two amounts together.
3
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.
6 X 6 tenths ?
36 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 0.6 3.6
4
Now try these questions on your own. You may need
some blocks to help you work these out.
Click again when you have completed each question
and the answer will be displayed.

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 ?

3.2
3.6
18
14.4
15.2
Need some more practise? Try Teacher Tools
Addition and Subtraction Book or Fractions,
Decimals and Percentages Book Numeracy resources