Percent Increase Decrease Using a Multiplier

When you increase an amount by 120%, to find the new amount in one step, what should you multiply the original amount by?

When you decrease an amount by 30%, to find the new amount in one step, what should you multiply the original amount by?

When you decrease an amount by 17%, to find the new amount in one step, what should you multiply the original amount by?

When you decrease an amount by 54%, to find the new amount in one step, what should you multiply the original amount by?

When you decrease an amount by 6%, to find the new amount in one step, what should you multiply the original amount by?

Increase $220 by 6%.

Mark spent $ 178 on groceries last month. If he reduces his grocery costs by 15% next month, how much will he spend on groceries?

• $ 204.70

• $ 151.30

• $ 124.60

• $ 26.70

Yesterday, Mrs. Dusterhoft had 70 tests to grade. Today she has 21 tests to grade. By what percentage did the number of tests she has to grade decrease?

• 60%

• 70%

• 30%

• 231%

Find the new amount.

710 points; 10% increase

• 71

• 639

• 781

• 720

Find the percent of change.

From 84 seconds to 8 seconds.

• 950% decrease

• 950% increase

• 90 percent decrease

• 90 percent increase