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sergij07 [2.7K]
3 years ago
14

Give one example of when would use the friendly numbers strategy to substract. Explain why

Mathematics
1 answer:
Andrei [34K]3 years ago
6 0
Here is one example of when you would use the friendly number strategy to subtract.
42 - 18

We will turn the 18 into a friendly number, which is going to be 20. 

(42 + 2) - (18 + 3)
44 - 20
Now it is easier to subtract 44 - 20 than it is 42 -18. With 42 - 18 we would have to barrow whereas with 44 -20 we do not have to barrow and we can do it in our head easier and makes it faster.
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