Understand the idea
Percentage change uses the starting value as the denominator. The same absolute increase can have different percentage meanings.
WORKED EXAMPLE
A fictional count rises from 40 to 50. The increase is 10; percentage increase = 10 / 40 × 100 = 25%.
Watch it step by step
Step 1 of 4Read
Read the labels and values: Before: 40, After: 50.
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- Read
Read the labels and values: Before: 40, After: 50.
- Represent
Compare the bars on a scale that starts at zero.
- Calculate
Work through the calculation in the example; result: 25.
- Interpret
Explain what the result means and what it does not establish.
TRY BEFORE CHECKING
Exercises with feedback
MAKE SOMETHING YOU CAN EXPLAIN
Your practical challenge
Show absolute and percentage change for 40 to 50 and for 80 to 90. Explain the difference.
These ticks are your self-review. They do not automatically assess project quality. Ask an adult or partner to review what you can show.
Use the skill in a new situation
Describe why a percentage increase from a zero starting value is undefined with this formula.