Grade 9 Percentages Checkin

Convert the fraction $\frac{3}{5}$  into a percentage

Calculate 40% of £3.50.

Calculate 15 out of 20 as a percentage.

Find 12.5% of £48.12

Increase 40 cm by 10%

William scores 16 out of 25 in a test. Emily gets 64%. Who did better? Show your calculations.

• Emily

• William

• They score the same

Rahan wants to buy a £50 watch from a shop. His mother tells him to wait until the winter sale. At the start of the sale the price of the watch is reduced by 20%. On the final day, the sale price is reduced by 10%. How much calculate will Rahan have to pay for the watch on the final day of the sale.

Keira buys a dress for £30 in a sale. It was advertised as ‘25% off’. Keira says “25% of £30 is £7.50, so I saved £7.50.” Explain why she is wrong, and show that she has actually saved £10.

Adding 10% to something is equivalent to multiplying by 1.1 (or 110%). Rail fares go up by 10%, and Josie’s new season ticket to London costs £1342. Calculate how much more she has to pay now than she did before the 10% increase was added.

Sasha earns £20 000 per year and asks her boss for a pay rise. Her boss says “I’ll raise your salary for the first half of the year by 5%, and raise it by a further 5% for the remaining half of the year.” Calculate the equivalent percentage increase in her salary for the whole year