Math Terms

Question 1

Identity

Answer 1

The identity symbol ≡ shows that two expressions are always equivalent.

Question 2

Linear expression

Answer 2

A linear expression is one where the highest power is 1. For example, 2x + 5 and a + 2b are linear expressions, but 2x^2 + 5 is not a linear expression.

Question 3

What is a hectare?

Answer 3

A hectare is a measure of area, 10000m2 and 0.01km2

Question 4

How do you identify if two portions are in direct proportion?

Answer 4

plotting them as a graph gives a straight line through the origin (0,0)
when one quantity is zero, the other quantity is also zero

Question 5

what are trends?

Answer 5

Line graphs can help you to identify trends in the data. The trend is the general direction of the change, ignoring the individual ups and downs.

Question 6

What are compound measures?

Answer 6

Compound measures combine measures of two different quantities. Speed is a measure of distance travelled and time taken. It can be measured in metres per second (m/s), kilometer per hour (km/h), or miles per hour (mph)

Question 7

Linear relationships

Answer 7

For a linear relationship the points on a graph form a straight line. When the points are not in a straight line the relationship is non-linear.

Question 8

If there is a question asking if a chart is misleading, make sure to look out for

Answer 8

No title; no labels or key; percentages add up to
more than 100; sectors are not in proportion.

Question 9

What is experimental probability

Answer 9

You can estimate the probability og an event using the results of an experiment. This is called finding the experimental probability. experimental probability = frequency of the event / total frequency

Question 9

What is the relative frequency

Answer 9

For a set of data, the relative frequency of a value = frequency of value / total frequency. You can calculate the expected frequency of a value in a larger set of data.

Question 10

what is a proportion

Answer 10

A proportion of a whole can be written as a fraction, a decimal or a percentage.

Question 11

how to work out percentage increase?

Answer 11

work out the difference. between the two numbers being compared.
divide the increase by the original number and multiply the answer by 100.
in summary: percentage increase = increase ÷ original number × 100.

Question 12

how do you find the original value of something that has been increased by a percentage?

Answer 12

formula : originalValue = newValue / (1 + percentageIncrease/100)

Question 13

What is the formula for compound interest?

Answer 13

n is the amount of years
amount = initial amount * ( 100 + Interest rate / 100)^n

Question 14

Alternate angles

Answer 14

When a line crosses two parallel lines it creates a ‘z’ shape. In side the Z shape are alternate angles. Alternate angles are equal.

Question 15

Corresponding angles

Answer 15

When a line crosses two parallel lines it creates an ‘F (U)’ shape. There are corresponding angles on an F shape. Corresponding angles are equal.

Question 16

Formula for the sum of the interior angles in a polygon?

Answer 16

S = (n - 2) * 180

Question 17

The sum of the exterior angles of a polygon always add to

Answer 17

360

Question 18

A scatter graph and correlation

Answer 18

A scatter graph shows a data set using two measures on the same graph. The shape of a scatter graph shows if there is a relationsjop or correlation between two measures

Question 19

What is the y intercept

Answer 19

The y-intercept is where a line crosses the y-axis.

Question 20

The gradient

Answer 20

The steepness of the graph is called the gradient.

Question 21

How to find the gradient?

Answer 21

To find the gradient, work out how many units the graph goes up ever 1 unit across. Gradients are positive (uphill) or negative (downhill) the larger the value, the steaper the gradient.
change in y / change in x