Similarity Scale Readiness

Problem pool

Core · Canonical TaskForm · Ratio part-total group-difference entry · Group Or Partition

Watch: Use the ratio parts and stated total to determine the group quantities, then enter the requested difference. The shell keeps the complete question visible, reserves the canonical reply band, and reveals proof on the same task objects.

Misread: Child action: Use the ratio parts and stated total to determine the group quantities, then enter the requested difference.

Curriculum: Mapped to Similarity Scale Readiness.

Similarity Scale Readiness practice with visual examples, common slips, and next-step routes.

Surface

This skill appears in Ratio part-total group-difference entry.

Task formats

Ratio part-total group-difference entry

Ratio part-total group-difference entry asks the player to use the ratio parts and stated total to determine the group quantities, then enter the requested difference.

ActionUse the ratio parts and stated total to determine the group quantities, then enter the requested difference.

CheckComplete the ratio part-total group-difference entry action.

UseSupport / Core / Transfer

ShowsCheck only

PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Fractions feel hard

Selection

Fresh independent work can move toward Core, Transfer, or Challenge routes; help use or confusion keeps support visible.

Help

Hints keep attention on the visible structure; reveals show the path without counting as independent evidence.

Presentation

Presentation can reduce reading and interaction load without changing the selected skill. Practice focus can bias compatible work without breaking prerequisites or story fit.

Story fit

Contexts that preserve the canonical mathematical action without changing the response or answer rule.