Grade 4 · Multiply 2-Digit Numbers

Multiply Multiples of 10: Tens × Tens

Steps

1. Tens × tens = hundreds. 10 × 10 = 100.
2. Regroup (Associative Property). 30 × 40 = (3 × 4) × (10 × 10) = 12 × 100 = 1,200.
3. Example: 50 × 60: 5 × 6 = 30 → 3,000.
4. Watch the trap! 20 × 50: 2 × 5 = 10, × 100 → 1,000 (three zeros).
5. Rhyme: “Tens times tens make hundreds: fact first, then two zeros!”

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Also watch: Arrays & Partial Products (2-Digit × 2-Digit)