A rectangle drawn as a grid shows a multiplication like 7 × 13. The student taps a grid line to cut it into two easier rectangles (7 × 10 and 7 × 3), writes the area of each part, then adds them for the total.
Any cut is accepted, as long as the parts and the total are right. Questions use hard single-digit facts, which split around 5, and teen numbers, which split around 10.
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