Multiplying tens I am learning to multiply tens

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. 3 X 2=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 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 Pg 21 & 22 of Teacher Tools Multiplication and Division Book Numeracy resources