Mathematics · Medium lesson
Percentage Change
Push a bit harder. Apply what you know to less familiar problems.
5
Questions
~4
Minutes
3
Hints/Q
Confidence tracking, 3-tier hints and instant feedback.
What you'll learn
- 1Increase: multiply by (1 + %/100). Example +15% → ×1.15.
- 2Decrease: multiply by (1 − %/100). Example −20% → ×0.80.
- 3Percentage change = (new − old) / old × 100.
Question mix
- Fill the gap×4
- Multiple choice×1
How it works
Score ≥ 80% to unlock the next level- 1
Rate your confidence
Tell us how sure you feel before answering. It powers your weak-topic map.
- 2
Use hints if stuck
Reveal up to 3 progressive hints per question. Using fewer earns more points.
- 3
See what went wrong
Instant feedback solves the exact question you just answered, so nothing stays fuzzy.
Ready when you are. This takes about 4 minutes.