Maths 2024 T3

Question 1

How to convert a decimal to a percentage without a calculator

Answer 1

move the decimal point 2 spaces to the right

Question 2

How to convert a percentage to a decimal without a calculator

Answer 2

Move the decimal point 2 places to the left

Question 3

How to increase a number by a certain percentage

Answer 3

Multiply the number by: 100% + the percentage you are increasing by

Question 4

How to decrease a number by a certain percentage

Answer 4

Multiply the number by: 100% - the percentage you are decreasing by

Question 5

percentage profit

Answer 5

% profit = profit/cost price x 100%

Question 6

percentage discount

Answer 6

% discount = discount/cost price x 100%

Question 7

time and a half

Answer 7

time and a half = 1.5 x hourly rate

Question 8

double time

Answer 8

double time = 2 x hourly rate

Question 9

What is gross income

Answer 9

total of all money earned

Question 10

net income

Answer 10

net income = gross income - deductions

Question 11

What is balance owing

Answer 11

amount left to repay

Question 12

What is repayment

Answer 12

money given each month to repay the loan amount and the interest

Question 13

compound interest

Answer 13

A = (1 + R)n

A = final balance
P = principal ($ invested)
R = rate per time period, as a decimal
n = no. of time periods money is invested for

Question 14

simple interest

Answer 14

I = PRN

I = simple interest
P = principal
R = rate per year, as a decimal
N = no. of time periods money is invested for

Question 15

gradient

Answer 15

m = rise/run

Question 16

down from left to right

Answer 16

negative gradient

Question 17

down from right to left

Answer 17

positive gradient