Multiplication
Selected multiples multiplication
Multiply a two-, three-, or four-digit number by selected multiples of 10, 100, and 1,000.
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Multiply by multiples of ten
Multiply whole numbers by values such as 20, 300, or 4,000 using place-value decomposition rather than a zero-counting shortcut alone.
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Rewrite the multiple of ten as a basic factor times a power of ten. Find the basic product, then apply the place-value shift.
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Learning objective
What this activity builds
Separate a nonzero basic fact from its power-of-ten scale and recombine them correctly.
Worked example
What is 40 × 300?
12,000
Use 4 × 3 = 12, then multiply by 10 × 100 = 1,000: 12 × 1,000 = 12,000.
Teaching notes
Make the practice count
- Say the expanded factors aloud before calculating.
- Check the number of place-value shifts with an estimate.
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Related activities
Multiplication
Multi-digit multiplication
Create double digit multiplication worksheets with the two-digit by two-digit preset, or practice other factor lengths. Ready-made sheets use two digits by one digit, with room for partial products.
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