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**Example text**

What is 94 x 93 ? Show the answer as a base and index. Indices 94 A. X 48 93 = 9 7 Which of the following two groups of examples contains a mistake? Work out each calculation in each group before deciding on your answer. Q. Group A. 92 x 9 6 10 5 7 7 = 10 X X 11 16 7 98 = 101 6 Go to 49. = 72 3 Group B. 101 7 102 82 X 10 1 6 = 103 3 52 = 154 X 82 X = 84 ) ) ) Go to 50. Indices 49 From 48 You say that Group A contains a mistake. Let us have a look at them again. 9 2 x 96 105 X 10 1 1 77 X 7 16 = 9 8 or another way to look at it 9 2 x 9 6 = 9 2 + 6 = 98 16 11 5 " " 10 X 10 = 10 = 10 5 X 10 11 = 105 + 11 = 10 16 = 723 another " "7 7 x 7 16 = 7 7 + 16 = 723 In each case the index figures (indices) of the multiplications were added together to give the index of the answer.

A score of 15 means that you need a further look at some of the frames. A score of 10 and under means that you really need to work through the programme again. The numbers in brackets after the answers are the frame numbers relating to the question. Read these frames first if your answer is wrong. You will most likely realise where your mistakes occurred. However, if you have any doubts, re-read the whole chapter. 1. 3 250 2. 4" 3. 6" (4) (6) (10) (4) (6) (10) (12) (15) (17) (18) 4. 3 1 000000 (17) (18) (23) (28) 5.

10 12 X 2. 106 10 3 = 10 6 - 3 = 10 3 3. 104 X 102 = 10 6 In the previous section we learned that to divide by a fraction we invert the fraction and multiply, for example, Similarly, in the following example; 1000 100 + 100 = 1 ~O x 10 ~OO = 1 000000 If we change the above example from numbers to terms of bases and indices we arrive at the following: 2 . 1 . 2. 1 10 100 -;- 10000 IS the same as 10 -;- 104 or 10-4 We are now dividing by a base with a negative index, we reverse the sign of the dividing index and multiply by it.