Multiplying tens I am learning to multiply tens, hundreds, thousands, and other tens numbers. 10,...

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

100

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100

100

100

100

100

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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)