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Add Within 20 Strategies

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

Surface

This skill appears in Add within 20 numeric entry, Equal-sum pair omission choice, Equal-groups plus partial total choice.

Task formats

Add within 20 numeric entry

Add within 20 numeric entry asks the player to solve one addition or missing-part addition relation with all values within 20 and enter the exact integer.

ActionSolve one addition or missing-part addition relation with all values within 20 and enter the exact integer.
CheckComplete the add within 20 numeric entry action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

Equal-groups plus partial total choice

Equal-groups plus partial total choice asks the player to inspect equal visible groups plus one smaller positive group and choose the exact total.

ActionInspect equal visible groups plus one smaller positive group and choose the exact total.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

Equal-sum pair omission choice

Equal-sum pair omission choice asks the player to pair the values to a common sum and choose the one omitted value that makes a complete equal-sum pairing possible.

ActionPair the values to a common sum and choose the one omitted value that makes a complete equal-sum pairing possible.
CheckComplete the equal-sum pair omission choice 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