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Sub Within 20 Strategies

Sub Within 20 Strategies practice with teacher guidance, common slips, and next-step routes.

Surface

This skill appears in Subtract within 20 related-equation entry.

Task formats

Subtract within 20 related-equation entry

Subtract within 20 related-equation entry asks the player to solve a subtraction fact or equivalent missing-part equation with exact integer values within 20 and enter the one missing integer.

ActionSolve a subtraction fact or equivalent missing-part equation with exact integer values within 20 and enter the one missing integer.
CheckComplete the subtract within 20 related-equation entry action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

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

  • episodes where visible quantities support an exact whole-number operation or relation