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Adding Decimals Workshop
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Adding Decimals Workshop
Aotearoa’s coastal field station is preparing supplies for a weekend survey. Add decimal quantities accurately, estimate first where asked, and show your working. Line up decimal points; add zeroes as placeholders when helpful.
Warm-up: choose a sensible estimate
For each sum, select the closest estimate before calculating.
1.Estimate 18.72 + 6.39 by rounding each number to the nearest whole number.
- About 15
- About 25
- About 35
- About 250
2.Calculate 18.72 + 6.39. Show how you aligned the decimal points.
Supply crate calculations
The team is checking weights and measurements before packing. Include units in your answers.
3.A crate contains 7.85 kg of dried food and 3.6 kg of fresh fruit. What is the total mass?
4.Two lengths of rope measure 12.075 m and 8.9 m. Find their combined length.
5.The water containers hold 14.68 L, 9.275 L and 6.4 L. How much water is there altogether?
Budget and data challenge
Use decimal addition to help the field team make decisions.
6.Aisha buys batteries for $16.75, a notebook for $4.90 and a marker for $2.85. What is the total cost in New Zealand dollars?
7.A sensor records 3.875 mm of rain in the morning and 12.46 mm in the afternoon. Calculate the total, then explain why your answer is reasonable using an estimate.
8.A student writes 5.8 + 2.47 = 7.105. Identify the place-value error and give the correct sum.
9.The team’s three sample masses are 15.6789 g, 23.45 g and 8.901 g. Find the total mass, showing how you made the decimal places line up.
10.Create a two-number addition problem with a total of 10.5. Use at least one number with three decimal places, then show that your addition is correct.
2 printable pages
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