We all need to check a bill from time to time.

The problem is, how do you do it when you're in a rush, when you're under pressure, and when you don't have a calculator handy?

Actually, it's not at all difficult if you know what to look for. Here's how to do it...

Example 1
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Suppose you are ordering some building supplies and you want to check that the price is about right before you open your check book.

You order 213 posts at $5.85 per post.

These numbers can be approximated to 200 posts at $6 per post.

Multiplying 200 and 6 is easy: the expected bill should be about $1200.

Basically you just look at the figures and round them to the nearest convenient unit. (That's why we approximated $5.85 to $6).

Example 2
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Similarly for 330 pieces of turf @ 65 cents each, just find 300