Percentages, income and commission

What is 25% of $440?

• $44

• $88

• $110

• $140

Using leading digit estimation, what is $89 x 21

• $870

• $900

• $1800

• $1887

What percentage would be used to show the original (starting) price of an item?

• 50%

• 100%

• 1%

• 200%

What is the original 100% as a decimal?

• 1

• 100

• 0.01

• 0.1

What is 20% as a decimal?

• 20.0

• 2

• 0.2

• 0.02

What is 10% of $450?

• $4.50

• $45

• $450

• $4500

If increasing a price by 35%, which of the following are correct? Tick all that apply.

• 1.35 x the price

• Find 35% of the price and add it to the original

• 135% of the price

• 35 x the price

If a sale is for 40% off the price of all items, which of the following would be correct calculations? Tick all that apply

• 0.4 x the original price

• Find 40% of the price and take from the original price

• Find 60% of the original price

• 0.6 x the original price

Is an increase of 10% followed by a decrease of 10% the same as the original?

• Yes, 10 - 10 = 0

• No, 10 x 1.1 = 11

  11 x 0.9 = 9.9

• I'm not sure

• I like maths

A $100 bag is reduced in price by 20% then again by another 20%. What would its price be?

• $60 obviously

• 100 x 0.2 x 0.2 = 0.04

  So $4

• 100 x 0.8 x 0.8 = 0.64

  So $64

• 100 x 0.8 x 0.8 = 0.64

  So $36