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jessicabaz
Use a calculator but it will give you a negative number one sec I will do it
highwireact
An estimation is just a rough guess; we turn the exact numbers into clean approximations to make them easier to work with, and that lets us get a good ball-park for the actual answer.

For example:

1) 1.64 / 22

1.64 is awfully close to 1.60, and 22 is nearest to 20, so we can use those rounded values to find that

1.64 / 22 ~= 1.60 / 20 = 0.08

Similarly, we have

2) 123.8 / 62 ~= 120.0 / 60 = 2

3) 6.15 / 31 ~= 6.00 / 30 = 0.2























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