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Decimal Multiplication Problems
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Decimal Multiplication Problems
For the first three problems, estimate before calculating. Show your exact calculation using the vertical-column method.
Estimate, then calculate
1.A walking track is 3.8 km long. What is the total distance covered by 6 laps? Write an estimate and then calculate the exact distance.
2.One jug holds 1.65 L of juice. How much juice is in 8 full jugs? Give an estimate and the exact amount.
3.A packet of seeds has a mass of 2.4 g. What is the mass of 9 packets? Write an estimate before working out the exact answer.
Decimal multiplication in everyday situations
4.A fabric shop charges $8.75 per metre. What is the cost of 3.6 metres of fabric?
5.A row of storage boxes is 2.45 m long. What is the combined length of 7 identical rows?
6.A water tank contains 3.6 L of water. Convert this amount to millilitres. Use 1 L = 1,000 mL.
7.Each serving of a snack contains 0.65 g of salt. How much salt is in 8 servings?
Think about decimal multiplication
8.Choose the statement that is always true when a positive whole number is multiplied by a positive decimal less than 1.
- The product is less than the whole number.
- The product is greater than the whole number.
- The product is always equal to the whole number.
9.Explain why multiplying a positive whole number by a positive decimal less than 1 gives a smaller product. Include a numerical example.
10.Write your own word problem that uses a decimal multiplied by a whole number. Then show the calculation and answer.
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