# New PDF release: Basic Mathematical Skills By THORN EMI Television Rentals Group Technical Training Department (auth.)

ISBN-10: 0333364120

ISBN-13: 9780333364123

ISBN-10: 1349070734

ISBN-13: 9781349070732

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Extra info for Basic Mathematical Skills

Sample text

You say 1 . 50' 25 -;- IS i5 . This is wrong. h 1 . 50 t e same as 25 -;- T You have remembered the rule, to divide we invert and multiply. Obviously, you have inverted 51° so that the problem now looks like 2~ x 5~ . Your answer is wrong. Where you have gone wrong is in adding 25 and 50 instead of multiplying. Have another look at 29 and work out the answer again. Fractions From 30 A. 1. - = 16 10000 = 160000 16 ~· _1 10000 1 x 1 2. =80 x50=4000 50 1 7 7 . 9 3 1500 37 1500 = T x -9- = 500 3. This completes the section on multiplication and division of fractions.

We know that 10 5 -;- 10 3 = 10 5 - 3 Now if instead of dividing by 10 3 we were multiplying by 10- 3 {notice the minus sign in front of the index}, this would give us: 10 5 x 10-3 = 10 5 - 3 Therefore, 10 5 x 10- 3 means the same as 10 5 -;- 10 3 . Go to 55 and we will have a look at this another way. 54 Indices Here is the same problem set out in three different ways. We know that the three different ways of expressing the problem as shown above amount to the same thing. Here is the problem written out in full: 10 5 100000 10 3 = 1000 or 100000 -;- 1000 = Q.

10 000 = 10 4 100 = 10 2 10 = 10 1 (we do not usually show an index of 1 but leave it as 10) Have you noticed anything about the number of noughts in relation to the index where the base is 10? 1 000000 = 10 6 10000 = 10 4 Q. What is the connection? 42 Indices A. The index is always the same as the number of noughts. You were quite right if you said something like this but note, this only appl ies when our base is 10. We can now see how to make this method save us a lot of time. Q. What is 10 3 short for?