# GCSE Maths OCR Flashcards

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What are the first four prime numbers?
2, 3, 5 and 7
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What is a multiple?
The multiples of a number are simply its times tables (e.g. the multiples of 6 are 6, 12, 18, 34 etc...)
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What is a factor?
The factors of a number are all the numbers that divide into it (e.g the factors of 24 are 1,2,,4,6,8 etc...)
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What is the Lowest Common Multiple?
The smallest number that will divide by all the numbers in question.
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What is the Highest Common Factor?
The biggest number that will divide into all the numbers in question.
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How many mm's are there in 40 cm's?
400.
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How many kilograms is one tonne?
1000.
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How many inches are in a foot?
12 inches.
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How many feet are in a yard?
3 feet.
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1 gallon = how many pints?
8 pints.
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How many pounds (lbs) are in a stone?
14 lbs.
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How many ounces are in a pound?
16 ounces.
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How many pounds is a kilogram?
2.2 lbs.
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1 meter = how many yards?
1.1 yards.
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How many cm's are there in a foot?
30 cm.
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How big, in centimetres, is 10 inches?
25 centimetres.
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What is a term?
A term is a collection of numbers, letters and brackets, all multiplied/divided together.
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Factorise 20x + 25x.
5x (4 + 5).
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What is a locus?
A locus is a line that shows all the points which fit in with a given rule.
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What is the formula for Pythagoras' Theorem?
a + b = c
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How do you find the midpoint of a line segment?
-Find the average of the two x-coordinates, then do the same for the y-coordinates. These will be the coordinates of the midpoint.
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What is wrong with this question; "What is your favorite subject? English, Maths or Science?" How could you improve the question?
It is a question that doesn't allow for all possible answers, e.g. someone might find History their favorite subject. You could add an "other" box.
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What is wrong with this question; "Do you agree that heavy metal music is really good music?" What would be a better way to phrase the question?
It is a leading/biased question. A better question would be "What type of music do you prefer to listen to?"
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What is wrong with the question "Do you play computer games a lot?" How would you phrase it differently?
It is an ambiguous question (one that could be interpreted differently by different people). A better question would be "How many hours do you play computer games per week?"
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What is the range?
How far from the smallest to the biggest.
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What does this sign '
Less than.
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What does this sign '>' mean?
Greater than.
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How do you work out the interquartile range?
Subtract the lower quartile from the upper quartile.
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What are the 4 steps to draw a box plot?
1. Draw the scale along the bottom. 2. Draw a box the length of the interquartile range. 3. Draw a line down the box to show the median. 4. Draw 'whiskers' up to the minimum and maximum.
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What is the formula for frequency density?
Frequency density = frequency ÷ class width.
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## Other cards in this set

### Card 2

#### Front

What is a multiple?

#### Back

The multiples of a number are simply its times tables (e.g. the multiples of 6 are 6, 12, 18, 34 etc...)

### Card 3

#### Front

What is a factor?

#### Back ### Card 4

#### Front

What is the Lowest Common Multiple?

#### Back ### Card 5

#### Front

What is the Highest Common Factor?

#### Back 