IXL - Percent of change: find the original amount word problems (Algebra 1 practice)

Mary just measured her pet snake and found out that it is 126 inches long, which is 50% longer than the last time Mary measured. How long was the pet snake last time?

inches

ref_doc_title.

Learn with an example

question

A mountain on a tropical island experiences changes in its height due to volcanic activity. Its current height is 5,232 meters, which is 20% taller than it was when the mountain was last measured. How tall was it then?

meters

solution

"20% taller" means you should add 20% to the original amount:

100% of original amount

20% of original amount

120% of original amount

Write and solve an equation:

final amount

120% of original amount

5,232

120% of

5,232

1.2

5,232

1.2

4,360

The mountain was 4,360 meters tall when it was last measured.

Looking for more? Try these:

Lesson: Percent change

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

Time
elapsedTime

hr	min	sec
00	00	02

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

Teacher tools

Work it out

Not feeling ready yet? These can help:

H.9Solve percent equations

H.11Percent of change: word problems

Lesson: Percent change

Excellent! You got that right!

Jumping to level 1 of 1

Excellent!