Guided written addition
The board highlights the current answer or carry cell so learners can focus on one small step at a time.
Sum Tass Sum
Practice written addition one cell at a time.
Sum Tass Sum helps children practice written addition with a guided grid, carry helpers, review, and local progress tracking for each profile.
Preparing for App Store
Learning flow
A focused practice loop for written addition.
Children choose an addition format, solve each cell in order, then review their own written work beside the correct layout.
Carry practice
Carry cells appear when needed, with hints and help tied to the current step.
Review after each set
Completed work is shown with mistakes and blanks marked for deliberate review.
Screenshots
Screens from practice to review.
These screenshots are taken from the iPhone release preparation build.
Home
Profiles, calendar progress, and recent activity stay visible.
Problems
Choose the addition format and start a short practice set.
Session
The current cell, carry helper, and keypad stay in one focused view.
Review
Completed work shows the learner answer beside the correct written addition.
Settings
Families can manage profiles, language, and local app preferences.
Public App Store pages
Support and privacy information for Sum Tass Sum is available here.
Release scope
The first release stores learning data locally and does not require account registration.