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Measuring Mass with Scales

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Measuring Mass with Scales

A community group is packing a kai (food) kit for a local event. Use the scale readings and mass facts below to check the ingredients and equipment. Show your working where you can. Remember: 1 kg = 1,000 g.

Read the scale data

The scale was placed on a firm, level bench and zeroed before each item was weighed. The empty bowl has been tared, so its mass is not included in the flour reading.

Item

Scale reading

Unit shown

Flour in tared bowl

1.25

Apples

680

Water bottle

1.08

Reusable lunch container

245

Make sense of the measurements

Use the table for Questions 1–5. Give units in your answers when appropriate.

1.Which statement best describes mass?

How much space an object takes up
The amount of matter in an object
How long an object is
How hot an object is

2.Why is the flour reading not affected by the bowl's mass?

3.Convert the flour reading, 1.25 kg, into grams.

4.Convert the apples' mass, 680 g, into kilograms.

5.Put the four items in order from lightest to heaviest. Include each item's mass in grams.

Check the kit and solve the scale puzzle

Use calculations and sensible units to help the group pack safely.

6.The flour and apples go into one crate. What is their combined mass in kilograms?

7.The group has 2 kg of rice and uses 750 g. How much rice remains? Give your answer in grams.

8.A digital scale displays 0.6 kg. True or false: this is the same as 60 g. Explain your choice with a conversion.

9.A student puts a lunch container on a digital scale and the display shows 245 g. They then place a wrapped snack inside it, and the display reads 390 g. What is the snack's mass?

10.The group needs to weigh a large sack of potatoes, about 8 kg. Would a scale displaying only whole grams or one displaying kilograms be more convenient? Give a reason.