Compare ratios

Target: Compare two ratios by a common quantity.

Language target: Say which mixture is stronger and why.

Likely miss: Students choose the mix with the larger total, or compare only one quantity.

Ask: If the water is the same, which has more concentrate?

If you see it: Make the second quantity match in both recipes, then compare the first.

Evidence to listen for: Both cells in a new row come from the same factor.

Next: Return to a double number line if addition appears. Otherwise compare two ratios.

Observable student moves: names both quantities, uses the represented relationship, and revises after feedback. This companion is not a score.