2014-10-15T17:39:55-04:00
To estimate it you can round both numbers:

91 ≈ 90
14 ≈ 15

You can cut 15 into 10 + 5, so you can do something like this:

90 * 10 + 90 * 5 =
= 900 + 450 =
= 1350

That's the estimate. Let's check how it should be with no rounding:

91 * 14 = 1274

So yeah, it's not that far away :)
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