4×4 Sudoku: explain every placement
Use a row, a column and a small box together to rule out candidates. A completed row alone does not prove the board is correct.
PIKO · LEARN & EXPLAIN
Learning library
Read an example, explain a step, then try an activity. These untimed guides cover selected skills; they are not a complete curriculum or an assessment.
Logic games
Robot routes: find the first wrong step
Plan a legal sequence of moves, trace every intermediate position and justify the number of steps.
Water jugs: calculate the space left
Track two quantities at once and calculate how much can move between containers without markings.
Connect every island: when the cheapest line is a trap
Compare total costs, spot a loop and connect every island without wasting a line.
Balance Lab: find a hidden weight using all the clues
Compare paired totals to find three unknown weights, then check your answer against every clue.
Foundation maths
Counting: one touch for each object
Match each object to one number word and understand that the final number tells how many there are.
8 + 5: make ten, then add what remains
Split one addend without changing its value and connect addition to subtraction.
Fractions: why equal parts matter
Identify the whole, count equal parts and distinguish a fraction’s numerator from its denominator.
Learning town
Town shop: read, total and give change
Connect an English order to quantities, calculate a total and check change using addition.
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This catalogue lists the supplementary topics currently selected for each map. Year labels are navigation choices, not national equivalence or official alignment. The written guides cover only the linked topics. Language exercises use Chinese on China paths and English on the other paths; changing the interface language does not translate those exercises.
Published topics and activities →About & help
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What each learning map contains