What is 1/4 as a decimal and percentage?
0.25 and 25%
What is 1/ 10 as a decimal and percentage?
10% and 0.1
What is 3/ 4 as a decimal and percentage?
0.75 and 75%
What is 1/5 as a decimal and a percentage?
0.2 and 20%
What is 1/3 as a decimal and a percentage?
0.33333333… and 33.333333…%
What is 2/3 as a decimal and a percentage?
0.666666… and 66.66666….%
How do you find 10% of a number with out a calculator?
divide the number by 10
How do you find 50% of a number with out a calculator?
Halve it
How do you find 1% of a number with out a calculator?
divide the number by 100
How do you find 25% of a number with out a calculator?
Halve it and halve it again
How do you find a percentage of a number with a calculator?
- Turn the percentage into a decimal (% divide by 100)
2. Multiple the decimal and the amount ( decimal x amount)
How do you find a new amount after a percentage increase with a calculator?
- 100% + the % it is increasing (to get a % bigger than 100%)
- Turn the percentage into a decimal (% divide by 100)
- Multiple the decimal and the amount ( decimal x amount)
How do you find a new amount after a percentage decrease with a calculator?
- 100% - the % it is decreasing (to get a % less than 100%)
- Turn the percentage into a decimal (% divide by 100)
- Multiple the decimal and the amount ( decimal x amount)
How do find an original number before an percentage decrease (Reverse Percentage)
- 100% + the % it is decreasing (to get a % more than 100%)
- Work out the multiplier by turn the new percentage into a decimal (% divide by 100)
- divide the amount by the multiplier
How do find an original number before an percentage increase (Reverse Percentage)
- 100% + the % it is decreasing (to get a % more than 100%)
- Work out the multiplier by turn the new percentage into a decimal (% divide by 100)
- divide the amount by the multiplier
How do you calculate a percentage change/ loss/profit.
The difference in the amounts divided by the original amount x 100
