Scale decimals using number facts
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Log in to continueMultiply and divide by multiples of powers of ten without a calculator.
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Calculate 1.42 × 30. Work without a calculator.
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Answer: 42.6
- Split the multiple of ten into its number fact and place-value scale.
- 1.42 × 30 = 42.6.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Multiply and divide by multiples of powers of ten without a calculator.
Read the official VCAA curriculum description (VC2M6N06)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M6N06-C01Multiplying by 300 combines multiplication by 3 with multiplication by 100. Use place value to track the scale rather than moving a decimal point without a reason.
- VC2M6N06-C02Dividing by a multiple such as 200 can be done by dividing by 2 and then 100. Check with the inverse multiplication.
- VC2M6N06-C03Track exact decimal multiplication and division through a linked calculation, using an estimate to check its magnitude.
- VC2M6N06-C04Demonstrating a non-calculator method and explaining a reasonableness check; an MCQ cannot prove which tools were used.
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Subskills
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Descriptor-derived subskills
- D01Combine a fact with a power of tenMultiplying by 300 combines multiplication by 3 with multiplication by 100. Use place value to track the scale rather than moving a decimal point without a reason.
- D02Undo a scaled productDividing by a multiple such as 200 can be done by dividing by 2 and then 100. Check with the inverse multiplication.
- D03Calculate linked scales and check the sizeTrack exact decimal multiplication and division through a linked calculation, using an estimate to check its magnitude.