Skill: ratios
Ratio Table Lab
Drag the sliders and watch a ratio scale. The table, the bar model, and the cross-product checker all move together — equivalent ratios are the same comparison at different sizes.
1 Scale a ratio
Pick a base ratio a : b and a scale. Every row of the table is an equivalent ratio.
Controls
Base ratio: 3 : 2
Bar model
Ratio table
2 Are these ratios equivalent?
Enter any ratio. The lab cross-multiplies it against your base ratio a : b and shows the verdict.
The test: a:b and c:d are equivalent exactly when the cross-products match, a × d = b × c.