More multiplication
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1 A box contains 16 mobile phones. 24 boxes of phones are packed onto a lorry.
How many mobile phones are there altogether? To find an answer we need to multiply 16 by 24. Let’s split the 24 boxes into two groups of 2 tens and 4 ones. We can multiply each group by 16, and then add the result together.
1 6
First multiply one box of 16 phones by 4.
There are 64 phones in 4 boxes.
×
2 4 2 6 4
1 6
Next, multiply a box of 16 phones by 2 tens.
×
2 4 6 4 1 3 2 0
There are 320 phones in 20 boxes.
1 6
× 2 4 6 4 + 3 2 0 3 8 4
Finally, add the results together.
Did you notice that when you multiply by the tens there will always be a 0 in the ones place?
There are 384 phones in 24 boxes.
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01/12/2021 14:51
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