Grade 7 · Math

7th grade Percent increase, percent decrease and percent error worksheet

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Percent increase, percent decrease and percent error

Grade 7 Math Worksheet - Building Confidence

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Circle the best answer, or write your answer on the line.

Row 100 | 60; row 10 | 6; then a blank row for the new amount. Ari's cookie recipe uses 60 grams of flour. Ari makes a bigger batch with 30% more flour. How many grams of flour does the bigger batch use?
Row 100 | 40; row 5 | 2; then a blank row for the new amount. Bo's class pond has 40 water lilies. After a sunny month it has 25% more water lilies. How many water lilies does the pond have now?
Row 100 | 120; row 5 | 6; then a blank row for the new amount. Esme runs 120 minutes a week. Next week Esme adds 15% more minutes, and the sneakers are thrilled. How many minutes will Esme run next week?
Row 100 | 80; row 10 | 8; then a blank row for the new amount. Jun's water bottle holds 80 ounces. Jun drinks 20% of the water before the bus. How many ounces are left?
Row 100 | 50; row 10 | 5; then a blank row for the new amount. Kira's sticker sheet has 50 stickers. Kira gives away 30% of them at lunch. How many stickers are left?
Row 100 | 160; row 5 | 8; then a blank row for the new amount. Luz's library cart held 160 books. 15% were put back on the shelves. How many books are still on the cart?
Milo counts 90 people at the park last Saturday. This Saturday there are 10% more people, and the swing line is long. How many people are at the park?
A bike trail near Pia's town is 64 miles long. The town makes it 25% longer. How long is the new trail?
Bo's recipe is made 20% bigger for a party. By what number do you multiply each amount to get the bigger recipe?
Jun's watering can leaks, so it holds 25% less water than before. By what number do you multiply the old amount of water to get the new amount?

7th grade Percent increase, percent decrease and percent error worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Percent change and percent error. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can find the new amount after a percent increase or decrease, and the number I multiply by (1.05 for "5% more", 0.9 for "10% less").
I can find the percent a quantity went up or down, and the percent error of a guess or a reading, by comparing the change to the old (or actual) amount.
I can go back from a new amount to the old one, do two percent changes in a row, and find the largest and smallest readings a tool can show.

Standard: 7.RP.A.3, 7.EE.A.2

Words to know

increase / decrease: Going up by a percent, or down by a percent, of the old amount.

the 100 row: The old (starting or true) amount. It is always 100%.

the change: How much the amount went up or down: new minus old, ignoring the sign.

multiplier: The number you multiply the old amount by to get the new amount, like 1.05.

percent error: How far a guess or reading is from the true amount, as a percent of the true amount.

Common mistakes

Your child found the change (the percent of the old amount) and stopped.

Your child added the percent number itself to the amount, as if 25% meant 25 more.

Your child subtracted the percent number itself from the amount, as if 25% meant 25 less.

What to say

Ask: after a 10% increase, is the new amount more than the old amount or just the 10%?

Ask: is 25% of 40 equal to 25?

Questions parents ask

What is the most common mistake with percent increase, percent decrease and percent error?

Your child found the change (the percent of the old amount) and stopped.

How can I help my child with percent increase, percent decrease and percent error?

Ask: after a 10% increase, is the new amount more than the old amount or just the 10%?

Are these 7th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 7 math

See all grade 7 math

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