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Money, Measures & Estimation
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Money, Measures & Estimation
Oliver, George and Alfie are checking supplies at a volcano observatory. Help them spend carefully and make sensible estimates. Show your working where useful.
Plan the supply budget
The team has £10.00 for a short field check. Prices: notebook £2.40, torch £3.65, flask of tea £1.80, measuring tape £2.75.
1.Oliver buys a notebook and a flask of tea. What is the total cost, and how much money will be left from £10.00?
2.Which pair of items costs more than £6.00 but no more than £7.00? Choose one and calculate its exact cost.
- Notebook + torch
- Torch + flask of tea
- Notebook + measuring tape
3.The team saves 75p each week for replacement batteries. How much will they save in 8 weeks?
4.A battery pack costs £4.50. At 75p saved each week, how many weeks are needed to save exactly enough?
Measure and estimate
Choose sensible units and compare the quantities carefully.
5.Match each observatory supply to the most suitable unit: a sack of rock samples; a small vial of water; one grain of sand. Units: grams, kilograms, millilitres.
- Sack of rock samples
- Small vial of water
- One grain of sand
- millilitres
- kilograms
- grams
6.A reusable water bottle holds about how much?
- 500 millilitres
- 5 litres
- 50 millilitres
7.Put these samples in order from lightest to heaviest: ash grain (3 g), rock fragment (250 g), sample bag (1 kg).
8.The observatory’s water tank contains 2 litres. The team uses 650 millilitres. Estimate the amount left to the nearest 100 millilitres, then give the exact amount.
9.A walk from the observatory entrance to the monitoring station is 240 metres. Which is a sensible estimate for walking at a steady pace?
- About 3 minutes
- About 30 minutes
- About 3 hours
10.George estimates that a storage crate is 4 metres tall. Is this likely to be sensible for a crate? Choose yes or no and explain briefly.
11.The team has £10.00 left for snacks. They want three items costing £2.35 each. Estimate the total by rounding each price to the nearest pound, then calculate the exact total and change.
3 printable pages
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