Mathematical content

Question 1

What are significant figures?

Answer 1

Long numbers might be rounded off to make them clearer E.G 432,765 to two significant figures = 430,000

Question 2

What is order of magnitude?

Answer 2

A means of expressing a number by focussing on the overall size. The number is expressed in terms of powers of 10

Question 3

What are three ways of expressing parts of a whole?

Answer 3

1. fraction
2. percentage
3. ratio

Question 4

How do you deduce a fraction?

Answer 4

by dividing the numerator and the denominator by the lowest common denominator

Question 5

How do you calculate a percentage?

Answer 5

percentage = number/ total number x 100

Question 6

How do you convert a percentage to a decimal?

Answer 6

Remove the % sign and move the decimal point 2 places to the left

Question 7

How do you convert a decimal to a fraction?

Answer 7

work out the number of decimal places in your number and this equals the number of zeros you must add onto
1. divide by this number and reduce fraction
E.G 0.275 has three decimal places–> 275/ 1000 –> 7/40

Question 8

How do you convert a fraction to a percentage?

Answer 8

divide the numerator by the denominator and multiply by 100 E.G 19/36 –> divide 19 by 36= 0.52777778 x 100 = 52.777778%

Question 9

What is a ratio?

Answer 9

it says how much there is of one thing compared to another thing

Question 10

What are two types of ratios?

Answer 10

1. part-to-whole ratio: show the number of something out of the total E.G 13 participants out of 30 = 13:20
   2.part-to-part ratio: comparing the thing in relation to another E.G comparing the number of ptpts in each condition –> 12 ptpts in condition A and 15 in condition B = 12:15