AMO Grade 4 · 3. Missing numbers and symbol puzzles
Find hidden numbers by working backwards, by thinking of an equality as a balance, by comparing or adding lines of symbols, and by testing hidden rules.
Find a missing number behind a chain of operations by working backwards, and check forwards.
Use the balance idea to remove a common part or add swapped lines in shopping problems.
Solve systems of shapes and letters by comparing lines or adding all lines.
Find and test a hidden rule in number boxes and follow a newly defined operation.