Rough,Guide,Everyday,Mental,Ca business, insurance A Rough Guide to Everyday Mental Calculation!
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===========================================================A Rough Guide to Everyday Mental Calculation!(c) Copyright 2004 by Murdo Macleod===========================================================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, whenyou're under pressure, and when you don't have a calculatorhandy?Actually, it's not at all difficult if you know what to lookfor. Here's how to do it...Example 1---------Suppose you are ordering some building supplies and you wantto check that the price is about right before you open yourcheck book.You order 213 posts at $5.85 per post.These numbers can be approximated to 200 posts at $6 perpost.Multiplying 200 and 6 is easy: the expected bill should beabout $1200.Basically you just look at the figures and round them to thenearest convenient unit. (That's why we approximated $5.85to $6).Example 2---------Similarly for 330 pieces of turf @ 65 cents each,just find 300 × 70 = 21000 cents = $210.--- TIP --------------------------------------------------When multiplying numbers ending in zeros e.g. 10 x 100 =1000: you always end up with the number of zeros added.So 1000 x 30,000 = 30,000,000 (7 zeros)--- TIP --------------------------------------------------Example 3---------If there are more items in the bill you can still get arough answer:62 planks @ $2.85 each,28 joists @ $6.99 each.Nails: $8Get 60 × 3 = 180 for the planks,and 30 × 7 = 210 for the joists.The nails are $8, let's say $10.So the rough total is: 180 + 210 + 10 = $400Now who needs a calculator?---------------------------------------------------------Excerpt from 'Fun With Figures Volume 2'. Discover how toperform everyday calculations the easy way - without havingto rely on your electronic friend!.http://FunWithFigures.com/vol2/---------------------------------------------------------
Rough,Guide,Everyday,Mental,Ca