Graphs of ratios

Target: Decide whether a point belongs to a ratio.

Language target: Name the factor for x and for y.

Likely miss: Students accept a point that is visually close but not a constant multiple of the base pair.

Ask: What factor takes the base x to this x?

If you see it: Ask, “What factor takes the base x to this x? Does that same factor work for y?”

Evidence to listen for: The student rejects a near point and names the shared factor.

Next: If graph points are unsteady, return to the table that generates them.

Homework mark for this device

Until a teacher sets it here, family practice is optional. Stars are an incentive, not a grade. This setting is local. It is not a district roster.

unset optional required incentive

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