NumIO learning activity

Fill the missing number in the equation

Fill the Gap turns an unknown number into a small puzzle that learners can solve with relationships they already know.

Learning goal

Use the known numbers and the operation to work out the missing value.

Read the equation, identify what is missing, and tap the number that makes the complete sentence true.

Have learners explain how they checked the equation after finding the gap rather than relying on a guess.

Pattern River — Help young learners spot a growing number pattern and practise skip counting by 2 on NumIO’s 1–100 number board.
Skip Count by 5 — Practise counting forward in groups of five with a colourful number board activity for kindergarten and early elementary learners.
Number Neighbors — Help children find the number before or after a clue and build early number sense with NumIO’s interactive number board.
Make 10 — Practise number bonds to ten by pairing a clue with its missing partner on NumIO’s interactive number board.
Addition Adventure — Use a 1–100 number board to solve addition sentences and explain each move in this playful early math activity.
Subtraction Safari — Solve subtraction sentences with a 1–100 number board and practise explaining the direction and size of each move.
Fill the Gap — Complete a missing part of an addition or subtraction equation by using clues from an interactive number board.
Speed Run — Build confidence with a short timed number-board mission that asks children to solve familiar addition prompts quickly.