Grade 4 · Multiply 2-Digit Numbers

Arrays & Partial Products

Steps

1. Break both numbers. 14 = 10 + 4, 12 = 10 + 2.
2. Box all four. 100, 20, 40 and 8 are the partial products.
3. Add. 100 + 20 + 40 + 8 = 168.
4. Example: 23 × 15 = 200 + 100 + 30 + 15 = 345.
5. Rhyme: “Break both numbers, box all four, then add!”

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Also watch: Multiply Multiples of 10 (Tens × Tens)