Maths Vocabulary Flashcards
What is an acute angle?
An angle less than 90 degrees.
What is a right angle?
An angle of 90 degrees.
What is an obtuse angle?
An angle greater than 90 degrees and less than 180 degrees.
What is a reflex angle?
An angle greater than 180 degrees.
What does BIDMAS mean and what does it stand for?
BIDMAS is the order of operations you do a calculation in. It stands for
Brackets
Indices
Division
Multiplication
Addition
Subtraction
What is an angle bisector?
A line that cuts an angle in half.
You should know how to construct one using a pair of compasses and a ruler.
What does consecutive mean?
Following on immediately from the term before
e.g. 3,4,5,6 are consecutive numbers
3,6,9,12 are consecutive multiples of 3.
What does congruent mean?
Exactly the same size and shape.
What does correlation mean?
The degree of relationship between two sets of data.
What is a cube number?
A number that is another whole number cubed e.g.
13 = 1 x 1 x 1 = 1
23 = 2 x 2 x 2 = 8
33 = 3 x 3 x 3 = 27
so 1, 8 and 27 are the first three cube numbers.
What is a cube root?
The number that, when cubed, equals the number given
e.g. the cube root of 8 is 2 since 23=8.
What is a denominator?
The denominator is the bottom number of a fraction.
What is an edge of a 3D shape?
An edge is a line where two faces meet.
What does equidistant mean?
The same distance away from two points.
e.g. A is equidistant from B and C
What is an exterior angle?
The angle formed between a polygon and a line extended fron one of its sides.
What is a face of a 3D shape?
A face is a flat surface on the solid.
What is a factor?
A factor is a number that divides into another number exactly.
e.g. 6 is a factor of 18
2 is a factor of 40
What does expanding an expression mean?
Multiplying out the brackets
e.g. 3(y + 1) = 3y + 3
What does factorising an expression mean?
Putting it into brackets.
e.g. 6z - 3 = 3(2z - 1)
What is the highest common factor (HCF) of two numbers?
The highest common factor is the biggest number that divides into both.
e.g. the HCF of 30 and 12 is 6
If you list the factors of 30 and 12, 6 is the largest number in both lists.
What is an improper fraction?
An improper fraction has a larger numerator than denominator.
What is an integer?
A positive or negative whole number.
What is an interior angle?
The angle formed between two adjacent sides of a polygon.
What does the intersection of two graphs mean?
The point where they cross.
What is a line of best fit?
A straight line drawn on a scatter graph that fits the data as closely as possible.
What is the lowest common multiple (LCM) of two numbers?
The smallest number that they both go into
e.g. the LCM of 6 and 8 is 24
If you write out the times tables of 6 and 8, 24 is the smallest number in both lists.
What is a multiple?
The multiples of a number are those numbers that can be divided by it; the numbers in its times table.
e.g. the multiples of 7 are
7, 14, 21, 28, 35,…
What is a numerator?
The number on the top of a fraction.
What is the origin on a graph?
The place where the axes cross. The point (0,0).
What does parallel mean?
Parallel lines have a constant distance between them and will never cross. They have the same gradient.
What does perpendicular mean?
Perpendicular lines cross at a right angle.
What is a polygon?
A polygon is a 2D shape with 3 or more straight sides.
What is a prime number?
A prime number has exactly two factors, itself and 1. The first five prime numbers are
2,3,5,7,11
1 is not a prime number.
What is a reciprocal?
The reciprocal of a number is 1 divided by the number.
To find the reciprocal of a fraction, flip it upside down.
e.g. the reciprocal of 2 is 1/2
the reciprocal of 4/7 is 7/4
What is a regular polygon?
A regular polygon has all side lengths and angles the same.
What does similar mean?
Similar shapes are exactly the same shape but can be different sizes.
What is a square number?
A number that is another whole number squared e.g.
12 = 1 x 1 = 1
22 = 2 x 2 = 4
32 = 3 x 3 = 9
so 1, 4 and 9 are the first three square numbers.
What is a square root?
A square root is the number that, when squared, equals the number given.
e.g. The square root of 4 is 2 since 22 = 4
What is a triangle number?
A number that can be represented by a traingular arrangement of dots. A number in the sequence
1, 1+2, 1+2+3, 1+2+3+4 etc.
What is a vertex?
A vertex is a corner of a 3D shape.
What is a mixed number?
A mixed number has a whole number part and a fractional part.
What is a hypotenuse?
The hypotenuse is the longest side of a right angled triangle; the side opposite the right angle.
What is cumulative frequency?
The cumulative frequency is the sum of all the frequencies so far in a distribution. It is a ‘running total’.
