Birthday Cakes

1
Birthday Cakes
I am learning to use multiplication to find a
fraction of a set.
of 16 ?
4
20
of . 4
2
Five people are sharing a birthday cake. There
are 30 pebbles spread evenly around the cake. How
many pebbles are on each fifth of the cake?
of 30 ?
Imagine those 30 pebbles being shared evenly
around the cake.
Your multiplication facts might help you. (5 X .
30)
6
We can check your answer by evenly sharing out
the pebbles.
So of 30 6
3
Four people are sharing a birthday cake. There
are 16 pebbles spread evenly around the cake. How
many pebbles are on each quarter of the cake?
of 16 ?
Imagine those 16 pebbles being shared evenly
around the cake.
Your multiplication facts might help you. (4 X .
16)
4
We can check your answer by evenly sharing out
the pebbles.
So of 16 4
4
Now lets try some questions where we know how
many pebbles are on one piece and we need to work
out how many are on the whole cake.
You can see that the cake to the right has 6
pebbles on one quarter of the cake.
of ? 6
We can use our addition facts to help us work out
the answer.
We could have used our multiplication facts
instead.
24
6
6
6
6
Total number of pebbles on cake.
4 X 6 24
24
Number of pebbles on one piece
Pieces of cake
of 6
5
You can see that the cake below has 3 pebbles on
one fifth of the cake.
of ? 3
We can use our addition facts to help us work out
the answer.
15
3
3
3
3
3
We could have used our multiplication facts
instead.
15
of 3
Total number of pebbles on cake.
5 X 3 15
Number of pebbles on one piece
Pieces of cake
6
Now try these questions on your own.
Click again when you have worked out all your
answers.
20
6) of .. 5 7) of . 10 8)
of . 7 9) of . 4 10) of . 9
1) of 16 ? 2) of 25 ? 3)
of 18 ? 4) of 36 ? 5) of 32 ?
4
10
30
6
35
27
20
36
16
Need some more practise? Try Pg20 21 of Teacher
Tools Fractions, Decimals and Percentages Book
Numeracy resources