Here are the list of prime factors of 24 and 36: 24 = 2 x 2 x 2 x 3 36 = 2 x 2 x 3 x 3 If we write down the numbers that are the same in both lists, they will give us the highest common factor of 24 and 36: HCF of 24 and 36 is 2 x 2 x 3 = 12
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How do you find the lowest common factor?
Which list has the most of each factor. 24 = (2 x 2 x 2) x (3) 36 = (2 x 2) x (3 x 3) 24 has the most 2s. (it has three 2s). And 36 has the most 3s (it has two 3s). So the LCM of 24 and 36 is (2 x 2 x 2) x (3 x 3) = 72.
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N0=
1
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N-1
1/N
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N1/2
square root N
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N1/3
square root 3N
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Converting recurring decimals into fractions
Times the decimal by 10/100/1000 depending on the number of decimal points and take the original away from it and use the answer over 9/99/999 as the fraction.
10 of 24
Easiest way to work out a percentage?
Divide smaller number by the denominator. Times by 100.
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What is a surd?
Awkward square root. A square root that doesn't give an exact integer answer.
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Line equation
y=mx+c
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What is m?
Gradient
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What is c?
y-intercept
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Gradient
rise/run
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Parallel lines
Same m (gradient). Change c to anything (within reason).
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Perpendicular
Gradient= 1/-m. Then y-intercept work out if given a point, or stays the same.
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