This drill mixes addition, subtraction and multiplication at a range that scales with difficulty — easy stays in small, mostly single-step territory, while medium and hard push into numbers large enough that a shortcut usually beats brute-force calculation.
Multiplication is where most of the useful tricks live: the shortcuts guide covers base-100 multiplication, the "close to a round number" method, and Vedic-style cross-multiplication — all of which turn multi-digit multiplication into something closer to a lookup than a calculation.
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