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Weight Comparison Using Scales

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Weight Comparison Using Scales

Compare masses in grams and kilograms. Remember: 1 kg = 1,000 g.

Reading and comparing masses

1.On a balance scale, the left pan drops lower than the right pan. Which pan holds the greater mass?

The left pan
The right pan
Both pans have equal mass

2.At a vet clinic, Hana weighs a kitten at 1.8 kg and a puppy at 2.4 kg. Choose the symbol that makes this statement true: 1.8 kg ___ 2.4 kg.

3.Write <, > or = in each space: a) 640 g ___ 0.64 kg; b) 1.25 kg ___ 1,205 g; c) 900 g ___ 0.9 kg.

4.Which items would usually have a mass greater than 1 kg? Select every correct option.

A full school backpack
A single paper clip
A medium-sized dog
An empty teaspoon
A large hardcover book

Masses at the vet clinic

Animal

Mass

Rabbit

1.6 kg

Small dog

4.2 kg

Cat

3.7 kg

Puppy

2.3 kg

5.Using the recorded masses, write the correct comparison symbol: 4.2 kg (small dog) ___ 3.7 kg (cat); 1.6 kg (rabbit) ___ 1.6 kg (rabbit).

6.Use the recorded-masses grid to answer: Which animal has the greatest mass, and which has the smallest mass?

7.Using the recorded-masses grid, how much greater is the cat's mass than the rabbit's mass?

8.Explain one way the recorded-masses grid makes it easier to compare the animals' masses.

Converting and solving

9.Arjun records a carrier's mass as 3.05 kg and a bag of pet food as 2,950 g. Convert the masses to the same unit and write the correct comparison: 3.05 kg ___ 2,950 g.

10.Oliver weighs a carrier at 0.82 kg and a crate at 850 g. Convert to grams and choose the correct comparison symbol: 0.82 kg ___ 850 g.

11.A balance scale has a 1.4 kg cat carrier in one pan and a 1,250 g parcel in the other. Which pan will move down? Show how you know.