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Decimal Multiplication Mastery
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Decimal Multiplication Mastery
Estimate before calculating. Show your working, and include units or a dollar sign where needed.
Estimate and Reason
1.Estimate 3.6 × 27 by rounding each factor to a nearby whole number. Show your rounded calculation.
2.Which is the closest estimate for 5.2 × 19?
- 50
- 100
- 150
- 200
3.Without calculating exactly, explain why 2.8 × 12 is less than 3 × 12.
Calculate with Decimal Factors
Use a vertical method where it helps. Give an estimate before each exact answer.
4.Calculate 3.6 × 27 using a vertical-column method. Show your working.
5.Estimate and then calculate 2.7 × 34. Include both your estimate and exact product.
6.Estimate and calculate 4.25 × 16. Write the product to two decimal places, then state how many decimal places it has.
7.For 4.25 × 16, explain how you can use 425 × 16 to work out where the decimal point belongs in the product.
Use Multiplication in Everyday Situations
8.A pack of coloured pencils costs $3.45. What is the cost of 24 packs? Write a multiplication equation, an estimate and the exact total.
9.A walking track is 2.75 km long. A group walks the full track 14 times. How far do they walk altogether?
10.A fruit shop sells mandarins for $4.80 per kilogram. What is the cost of 7.5 kg?
11.A café uses 0.85 kg of oats for one batch of muesli bars. It makes 18 batches. Is a total of 15.3 kg reasonable? Explain using an estimate.
3 printable pages
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