Percentages - increase and decrease (calculators allowed)

100% means the total amount of something.

• true

• false

How do you interpret the % symbol?

Which of these numbers are equivalent to 20%?

• $\frac{1}{4}$

• 0.2

• $\frac{20}{100}$

• 20

Which of these numbers are equivalent to 5%?

• 0.5

• $\frac{1}{20}$

• $\frac{5}{10}$

• 0.05

To find 15% of $230 on a calculator, you can type

 $15\div100\times230$  

• true

• false

To find 15% of $230 on a calculator, you can type

 $0.15\times230$  

• true

• false

Which of these calculations would give you 27% of $120?

• $120\div27$

• $27\times1.2$

• $120\div0.27$

• $0.27\times120$

Which is greater: 30% of $70 or 70% of $30?

• 30% of $70

• 70% of $30

• neither

If a jacket is reduced by 12% in a sale, what percent of the original cost would you pay?

• 12%

• 88%

A jacket was originally priced at $890. What single calculation would give you the sale price after the 12% discount?

• 0.12 x 890

• 0.88 x 890

• 890 - 12

• 890 - 88