MATHS TEST 31/03/25

does NOT contain things on repeated percentage changes or ratios, also doesn't go into a lot of details on scale models, also doesn't have much on bearing wow i didnt do a lot here

How do you find a value before a percentage change?

divide it by the multiplier

How do you find a value after the percentage change?

multiply it by the multiplier

EXAMPLE: What value does multiplying by 1.02 find?

the value after a 2% increase

EXAMPLE: What value does multiplying by 0.98 find?

the value left after a 2% decrease

EXAMPLE: What value does dividing by 1.27 find?

the value before a 27% increase

EXAMPLE: What value does dividing by 0.73 find?

the value before a 27% decrease

What is a compound interest?

when a value increases by the same percentage each year or other timeframe

What is depreciation?

when a value decreases over time

What does a scale model of 1:n mean?

One unit of length on a model corresponds to ‘n’ units of length on the real thing

How do you find the bounds of a number?

Find the value that comes before, correcting to the nearest unit and the bounds are found halfway between them

How do you find the lower bound by addition?

lower + lower

How do you find the lower bound by subtraction?

lower - upper

How do you find the lower bound by multiplication?

lower x lower

How do you find the lower bound by division?

lower / upper

How do you find the upper bound by addition?

upper + upper

How do you find the upper bound by subtraction?

upper - lower

How do you find the upper bound by multiplication?

upper x upper

How do you find the upper bound by division?

upper / lower