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Cogito

Grade 7 Math · Chapter 3 · Lesson 1

Practice Worksheet

Percent Increase and Decrease

Change measured against where you started.

10 problems · about 18 minutes · 7.RP.A.3

NameDate

Figure — use these to answer the problems

Set the factor above or below 1 and watch the bar grow or shrink.
Before: 10
After: 12
1 1/5 × 10 = 12
Original amount10
Factor top number6
Factor bottom number5
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

1 problem

  1. From “Unit Rates with Fractions”

    ⅖ mile in ⅕ hour. Miles per hour?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A 120 pound item falls 25%. New price?

    Answer

  2. Percent change is divided by which amount?

    • The original amount.
    • The new amount.

  3. A 50 pound item rises 10%. New price?

    Answer

  4. A 90 pound item falls 20%. New price?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. From 20 to 25. Percent increase?

    Answer

  2. From 50 to 40. Percent decrease?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

3 problems

  1. The Sale

    A 60 pound coat is reduced by 25%. What is the new price?

    Answerpounds

  2. The Rise

    A price rises from 80 to 100. What is the percent increase?

    Answerpercent

  3. The Tax

    A 200 pound item has 20% tax added. What is the total?

    Answerpounds