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Maths GCSE :( > Yr 8 > Flashcards

Yr 8 Flashcards

1
Q

a³ × a⁴

A

a⁷

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2
Q

(a³)⁴

A

a¹²

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3
Q

a³ ÷ a⁴

A

a‐¹

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4
Q

a⁰

A

1

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5
Q

What is the equation for sum of interior angles

A

Let n = number of sides of shape

180(n-2)

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6
Q

Equation for exterior angle?

A

180 - interior angle

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7
Q

Sum of exterior angles?

A

360°

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8
Q

How to work out number of sides from exterior angle?

A

360/exterior angle

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9
Q

What is the first significant figure? (Sig fig)

A

The first non-zero digit

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10
Q

Area of a triangle?

A

b = base
h= height

2

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11
Q

Equation for area of a parallelogram

A

bh

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12
Q

Equation for a trapezium?

A

a = shorter top side iykwim

2
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13
Q

Equation for circumference of a circle?

A

C = πd

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14
Q

Equation for diameter of a circle?

A

d = 2r

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15
Q

Equation for area of a circle?

A

A = πr²

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16
Q

Equation for a straight line?

A

y = mx + c

m = gradient
c = y intercept

17
Q

How to calculate gradient?

A

Change in x

18
Q

Which is the y axis

A

The up-down one

19
Q

Which is the x axis?

A

The left-right one

20
Q

Equation for (avg.) speed?

A

Distance/time

21
Q

Volume of a prism?

A

Area of cross-section × length

22
Q

Volume of a cylinder?

A

πr²h

23
Q

SA of a cylinder?

A

2(πr²) + ch
OR
2(πr²) + πdh
OR
2(πr²) + π2rh

24
Q

What is a multiplier

A

The number you multiply an original value by to get a new value

25
Q

What is a 20% increase as a multiplier?

A

1.2

26
Q

What is a 20% decrease as a multiplier?

A

0.8

27
Q

What is a 20% decrease as a multiplier?

A

0.8

28
Q

What is a 150% increase as a multiplier?

A

2.5

29
Q

What is a 150% increase as a multiplier?

A

2.5

30
Q

How to calculate original value?

A

Multiplier

31
Q

Hoe to calculate percentage change

A

Original value

32
Q

How do you describe a translation?

A

A translation by (x)
(y)

But it’s one big bracket

33
Q

How to describe a reflection?

A

A reflection in the line..(line equation)

34
Q

How to describe an enlargement?

A

An enlargement about the point (x,y) with scale factor (…)

35
Q

Define congruent

A

Two shapes that are exactly the same shape and size

36
Q

Define similar shapes

A

Two shapes in same shape but sized proportionally

37
Q

How is scale factor calculated?

A

Ratio between 2 corresponding sides
(12/8 = scale factor of 1.5)

Maths GCSE :( (7 decks)

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