Multiplying tens
I am learning to multiply tens, hundreds, thousands, and other
tens numbers.
1000, 2000, 3000
10, 20, 30
100, 200, 300
Below are 3 groups of 20 counters. How many counters are
there in total? 3 X 20 = ?
We can see there are 3 groups with 2 sets of 10.
We can work out how many tens there
are using our multiplication basic facts.
3X2=6
That means that are 6 groups of ten
which is 60 counters.
Notice how working out
3 X 2 = 6 helped us work out
3 X 20 = 60
Below are 4 groups of 30 counters. How many counters are
there in total? 4 X 30 = ?
We can see there are 4 groups with 3 sets of 10.
We can work out how many tens there
are using our multiplication basic facts.
4 X 3 = 12
That means that are 12 groups of ten
which is 120 counters.
Notice how working out
4 X 3 = 12 helped us work out
4 X 30 = 120
We can also use our basic facts to help us when multiplying by
hundreds or thousands.
Below are 3 groups of 500 counters. How many counters are
there in total? 3 X 500 = ?
We can see there are 3 groups with 5 sets of 100.
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
We can work out how many hundreds
there are using our multiplication basic
facts.
3 X 5 = 15
That means that are 15 groups of one
hundred which is 1,500 counters.
Notice how working out
3 X 5 = 15 helped us work out
3 X 50 = 1,500
The questions to the left can be made easier by identifying a
multiplication basic fact that helps. Which questions go together?
1) 3 X 80 = ? 240
4 X 4 = 16
2) 5 X 60 = ? 300
5 X 6 = 30
3) 4 X 40 = ? 160
3 X 8 = 24
4) 5 X 300 = ? 1,500
5 X 6 = 30
5) 5 X 600 = ? 3,000
5 X 3 = 15
Now try these questions on your own.
Click again when you have worked out all your answers.
1) 8 X 30 = ?
240, (8 X 3 = 24)
2) 7 X 50 = ?
350, (7 X 5 = 35)
3) 3 X 400 = ?
1,200 (3 X 4 = 12)
4) 2 x 900 = ?
1,800 (2 X 9 = 18)
5) 6 X 40 = ?
240, (6 X 4 = 12)
Need some more practise? Try Pg21 & 22 of Teacher Tools Multiplication
and Division Book Numeracy resources