Add Sub Within 1000 Algorithm

Problem pool

Core · Canonical TaskForm · Add within 20 numeric entry · Enter Value

Problem number / 8

Watch: Solve one addition or missing-part addition relation with all values within 20 and enter the exact integer. The shell keeps the complete question visible, reserves the canonical reply band, and reveals proof on the same task objects.

Misread: Child action: Solve one addition or missing-part addition relation with all values within 20 and enter the exact integer.

Curriculum: Mapped to Add Sub Within 1000 Algorithm.

Add Sub Within 1000 Algorithm practice with visual examples, common slips, and next-step routes.

Surface

This skill appears in Add within 20 numeric entry, Ordered-category cut piece count, Source-free numeric equivalence entry, Subtract within 20 related-equation entry, Ten-frame number-bond entry, Equal-groups plus partial total choice, Multiplication array-chart entry, Component-bundle minimum 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

Component-bundle minimum choice

Component-bundle minimum choice asks the player to compute the minimum number of fixed-capacity bundles needed to cover all components and choose the exact count.

ActionCompute the minimum number of fixed-capacity bundles needed to cover all components and choose the exact count.

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-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

Multiplication array-chart entry

Multiplication array-chart entry asks the player to interpret or complete the array or multiplication chart and enter the exact product, factor, or missing cell value.

ActionInterpret or complete the array or multiplication chart and enter the exact product, factor, or missing cell value.

CheckComplete the multiplication array-chart entry action.

UseSupport / Core / Transfer

ShowsCheck only

PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

Ordered-category cut piece count

Ordered-category cut piece count asks the player to apply the stated category-based cut rules in order to the pieces that currently exist, preserve any declared equal-part relation, then enter the exact total number of pieces.

ActionApply the stated category-based cut rules in order to the pieces that currently exist, preserve any declared equal-part relation, then enter the exact total number of pieces.

CheckComplete the ordered-category cut piece count action.

UseSupport / Core / Transfer

ShowsCheck only

PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

Source-free numeric equivalence entry

Source-free numeric equivalence entry asks the player to compute or transform the target quantity from source-neutral exact givens and enter an exactly equivalent numeric response under the declared unit and equivalence policy.

ActionCompute or transform the target quantity from source-neutral exact givens and enter an exactly equivalent numeric response under the declared unit and equivalence policy.

CheckComplete the source-free numeric equivalence entry action.

UseSupport / Core / Transfer

ShowsCheck only

PresentationCompact / Standard / Extended

Practice focus

Math facts / times tables / Number sense and place value

Ten-frame number-bond entry

Ten-frame number-bond entry asks the player to use the ten-frame and number-bond relation to enter the missing part, whole, or related fact.

ActionUse the ten-frame and number-bond relation to enter the missing part, whole, or related fact.

CheckComplete the ten-frame number-bond 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

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