multiplication smorgasbord
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Multiplication Smorgasbord. I am learning to solve multiplication problems using a variety of mental strategies. - PowerPoint PPT PresentationTRANSCRIPT
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Multiplication Smorgasbord
I am learning to solve multiplication problems using a variety of mental strategies.
Work it out in your head
At a smorgasbord there are lots of different foods to choose from. You now know a lot of different multiplication strategies. Now we are going to try and choose the best strategy for each question.
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All the containers below hold 29 counters. How many counters are there in total?
10
10
10
10
10
10
3 X 29 = ?
Option 1:
We could work out how many tens there are and how many ones there are then add that amount together.
3 X 20 = 60 3 X 9 = 27 60 + 27 = 87
There are a number of different ways we could answer this problems.
So 3 X 29 = 87
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All the containers below hold 16 counters. How many counters are there in total?
10
4 X 16 = ?
Option 1:
10 10 10
I don’t know what 4 X 16 equals but I do know that 4 X 8 = 32.
Since 8 is only half of 16 I must need to add that same amount again.
4 X 16 = (4 X 8 ) + (4 X 8)
4 X 16 = 32 + 32 So 4 X 16 = 64
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All the containers below hold 16 counters. How many counters are there in total?
10
4 X 16 = ?
Option 2:
10 10 10
I’m going to try doubling and halving.
Now let’s try a different method.
This will mean there will be twice as many groups (8) with half as many in each group (8) 4 X 16 = ?
8 X 8 = 64
X2 ÷2
So 4 X 16 = 64
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Choose the best method for working out the questions below and answer.
1) 4 X 25 = ?
2) 3 X 27 = ?
3) 6 X 39 = ?
4) 7 X 22 = ?
5) 4 X 24 = ?
Need some more practise? Try Pg34 & 35 of Teacher Tools Multiplication and Division Book Numeracy resources
Click again when you have worked out all your answers. A strategy for answering each of these questions will be displayed. Please note that this is only one possible solution. Your answer however should be the same.
100, 2 X 50 = 100
81, 9 X 9 = 81
234, (6 X 40) – (6 X 1 ) = 234
154, (7 X 20) + (7 X 2) = 154
96, (4 X 12 = 48) double this amount.