Number Fill
Find the missing number in every equation — a puzzle-style module that deepens number sense and flexible thinking.
What children practise in Number Fill
Each math step reuses the skill before it, so new sums feel like a small win rather than a leap — that is how mental fluency is actually built.
Inside Number Fill, practice is split into short rounds with instant feedback — children always know how they are doing, and parents can watch the streak grow day by day.
Sample content
Fill the gap and complete the equation
See Number Fill in the app
Number Fill lives inside the Mental Math track — here is how it looks in context.
More from Mental Math
Keep the daily routine rolling with these neighbour modules.
Frequently asked questions
What age is Number Fill designed for?
Number Fill works best for children aged 3 to 8 — from playful first exposure in kindergarten to confident fluency before Grade 1 and 2. Younger children start with shorter sessions and plenty of help.
How long should a daily Number Fill session be?
About 10 minutes. Short, frequent practice builds stronger memory than one long weekly session, and it keeps the experience feeling like play rather than homework.
Does Number Fill require any parent preparation?
No. Each session is self-explanatory: children see the content, hear the model and practise with instant feedback. Parents can simply sit alongside for encouragement — or enjoy the coffee while it lasts.