Percent increase, percent decrease and percent error

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   Kira's town had 360 people at the summer fair. This year the fair had 35% more people, and the lemonade line wrapped around the block. How many people came this year?

   486
2. 2.

   Milo's sailing club sailed 240 miles last summer. This summer it sailed 45% more miles. How many miles did the club sail this summer?

   348
3. 3.

   Pia's bunch of grapes weighed 320 grams. Pia ate 45% of it on the hike. How many grams of grapes are left?

   176
4. 4.

   A seedling at Zee's school is 30 centimeters tall in April and 75 centimeters tall in July. By what percent did its height increase?

   150
5. 5.

   Ari's book club read 15 books last year and 60 books this year, because the new library opened. By what percent did the number of books increase?

   300
6. 6.

   Kira's class had 20 pizza slices, and 5 are left after lunch. By what percent did the number of slices decrease?

   75
7. 7.

   Luz's paper stack had 80 sheets, and 72 sheets are left after a project. By what percent did the stack decrease?

   10
8. 8.

   Ren times a race with a stopwatch and reads 84 seconds. The real time is 80 seconds. What is the percent error of the reading?

   5
9. 9.

   Tala's bean plant is x centimeters tall. Next week it will be 12% taller. Which expression gives next week's height?

   • 1.12x
   • 0.88x
   • x + 0.12
   • 0.12x
10. 10.

    x is the number of pages Ari had left to read. After a long evening, Ari has 15% fewer pages left. Which expression gives the pages left now?

    • 0.15x
    • 1.15x
    • x − 0.15
    • 0.85x