Equivalent ratios

Target: Create an equivalent ratio by multiplying both parts by the same factor.

Language target: Name the shared factor.

Likely miss: Students add the same number to both parts of a ratio.

Ask: What factor was used on both parts?

If you see it: Have the student underline both products and name the shared factor before computing.

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.