Interactive resource
Fraction Bar Visualizer
Arithmetic. Understand fractions with an interactive fraction-bar model — whole vs parts for early elementary math.
Overview
A fraction relates a whole to its parts. Bar models turn abstract symbols into comparable lengths.
Explanation
Fraction m/n means: divide a unit into n equal parts and take m of them.
Denominator n = how many parts; numerator m = how many you take.
Larger denominator → each part is smaller (same whole).
How to use
- Open the fraction-meaning scene.
- See how the bar encodes numerator and denominator.
- Compare lengths of different fractions.
- Build meaning before fraction operations.
Teaching tip
Keep the denominator fixed and change the numerator to stress “how many equal parts are taken.”
Knowledge points
FAQ
Unlike denominators?
This page focuses on meaning; addition with like/unlike denominators has dedicated scenes in the viz catalog.
Is this tool free?
Yes. It runs in the browser with no install.
Good for class demos?
Yes — project it and ask what changes when you drag a parameter.
How do I write the formula afterward?
Open the equation editor or symbol sheet and copy a clean expression.