# MATHS

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• Created by: holly2001
• Created on: 23-03-15 13:19
Simple % 38% of 90
0.38 x 90 = 342
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Increase £30 by 2%
100 + 2 = 102% 1.02 x30 = £30.60
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Decrease £72 by 12%
100 - 12 = 88% 0.88 x 72 = £63.36
3 of 17
Repeted changes
Use the multipliers use a power if we use the same multipliers more than once.
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£2500 is invested in the bank an intrest rate of 3% for 34 years. How much do you have at the end?
100+3=103 1.03 to the power of 4 x 2500 = 2813.7720 = £2813.77
5 of 17
Reverse Perceentage
Look out for Key words BEFORE, ORIGINAL, use the mutiplier that Increase, decrease that has happend.
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After a pay increase at 3% Anita earns £5.15 an hour. What did she earn before?
100+3=103% 1.03 x x = 5.15 x= 5.15 = 1.03 x=£5
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One number as a percentage of another write 82 as a percentage of 75
82/75 x100 = 109.333... = 109%
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Profit/loss
% = actual profit/loss dicide by original x100
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Price index
The index in the base year is 100. The index in the future is the percentage compared with the base year.
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Terminating decmals ....
STOP
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Recuring decimals ....
CARRY ON FOREVER IN A REPEATING PATTERN
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Converting fractiond to decimals
Divide the number by thr denominator. Stop when wither : You have no remaninder (Terminating) or you stop because a pattern in the answer is starting to occur.
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Rounding to 1 significant figure
Only 1 number which isn't a )(That has to be the first number)
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375 ..
400
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0.73
0.7
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Estimation
We estimate by rounding to one significant figure
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## Other cards in this set

### Card 2

#### Front

100 + 2 = 102% 1.02 x30 = £30.60

#### Back

Increase £30 by 2%

### Card 3

#### Front

100 - 12 = 88% 0.88 x 72 = £63.36

### Card 4

#### Front

Use the multipliers use a power if we use the same multipliers more than once.

### Card 5

#### Front

100+3=103 1.03 to the power of 4 x 2500 = 2813.7720 = £2813.77