Flashcards
Number and Algebra
Cards in this deck (8)
- 1See a bracket – deal with it first!! 5(x + 2) = 155(x + 2) = 15
5x + 10 = 15
5x = 5
x = 1 - 2To simplify surds like √50, you can split a surd into its factors When splitting, look for square numbers√50 = √25 x √2 = 5√2
√98 = √49 x √2 = 7√2
√50 + √98 = 5√2 + 7√2 = 12√2 - 3To find a % increase, you must do % increase = increase/original x 100 e.g. To increase from 7 to 12% increase = 5/ 7 x 100 = 71%
- 4To find equation of a straight line use y = mx + cm = gradient
c = y intercept - 5To increase by 5%, multiply by ?1.05
- 6To decrease by 17% multiply by ?0.83
- 7If a surd is on the bottom of a fraction, get rid of it!! If a surd is on the bottom such as √2, then multiply top and bottom by √222 / √2 = (22 x √2) / (√2 * √2)
=22 * √2 / 2
= 11 * √2 - 8If given that after a 22% decrease something costs £5 then ...we know 78%=£5
then we find 1%= 6.41p
and then 100% to get
original price = £6.41
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- GCSE Mathematics Flashcards on Number and Algebra, created by Rick Wear on 20/04/2017.
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- Rick Wear
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