Stage 2 · The Four Operations & Estimation

2.2.5 Multiplying Two Two-Digit Numbers

2.2 Multiplication: Several Equal Piles

Point 5 of 6

2.2.5 Multiplying Two Two-Digit Numbers

Core idea

Multiply by the ones first, then the tens, shift one column over, and add — like two floors stacked on top of each other.

Module goal. Compress repeated addition of equal amounts into multiplication, memorize the times facts, and master multi-digit column multiplication.
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