# Y9 All Maths Formulae [End of years revision]

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Percentage of an amount

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From Year 9 Maths, Physics, Chemistry and Biology

### 19 Terms

1

Percentage of an amount

percent x amount

100

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2

Density

mass

volume

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3

Turn a fraction into a percentage

fraction x 100

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4

Percentage change

change x 100

original

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5

Area of a trapezium

a + b x height

2

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6

Area of a parallelogram

base x height

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7

Volume of a prism

cross sectional area x height (or length depending on your shape)

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8

Weight (using mass)

mass x 10

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9

Pressure

force

area

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10

Capture-Recapture

Initially tagged = Recapture tagged

Population (x) sample size

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11

Position of median

Number of items + 1

2

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12

Lower quartile

(n + 1) th value

4

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13

Upper quartile

3(n + 1) th value

4

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14

Mean

total fx

total f

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15

Circumference of a sector

angle x 2πr

360

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16

Area of a sector

angle x πr²

360

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17

Compound interest

starting money x multiplier^number of years

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18

Area of a circle

πr²

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19

Area of a triangle

base x height

2

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