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Multiplying tens
I am learning to multiply tens, hundreds, thousands, and other tens numbers.
10, 20, 30
100, 200, 300
1000, 2000, 3000
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.
3 X 2 = 6
That means that are 6 groups of ten which is 60 counters.
Notice how working out3 X 2 = 6 helped us work out3 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 out4 X 3 = 12 helped us work out4 X 30 = 120
We can also use our basic facts to help us when multiplying by hundreds or thousands.
3 X 500 = ?
We can see there are 3 groups with 5 sets of 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 out3 X 5 = 15 helped us work out3 X 50 = 1,500
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100
Below are 3 groups of 500 counters. How many counters are there in total?
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 = ?
2) 5 X 60 = ?
3) 4 X 40 = ?
4) 5 X 300 = ?
5) 5 X 600 = ?
3 X 8 = 24
5 X 6 = 30
4 X 4 = 16
5 X 3 = 15
5 X 6 = 30
240
300
160
1,500
3,000
Now try these questions on your own.
1) 8 X 30 = ?
2) 7 X 50 = ?
3) 3 X 400 = ?
4) 2 x 900 = ?
5) 6 X 40 = ?
Click again when you have worked out all your answers.
240, (8 X 3 = 24)
Need some more practise? Try Pg21 & 22 of Teacher Tools Multiplication and Division Book Numeracy resources
350, (7 X 5 = 35)
1,200 (3 X 4 = 12)
1,800 (2 X 9 = 18)
240, (6 X 4 = 12)
