Mathematics · Beginner lesson
Letters as Numbers
Build the core idea from scratch with gentle steps and lots of hints.
5
Questions
~4
Minutes
3
Hints/Q
Confidence tracking, 3-tier hints and instant feedback.
What you'll learn
- 1In algebra, letters stand for unknown numbers.
- 22x means 2 × x.
- 3Collect like terms: 3x + 2x = 5x.
- 4You can substitute values in place of letters.
Question mix
- True / False×1
- Multiple choice×3
- Fill the gap×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.