Measurement

Hong Kong

Stage 1

Lesson

When we think about how heavy something is, we are thinking about its mass. We use units of measurement to describe the mass of objects, such as grams and kilograms.

If we are comparing objects that use the same units of mass, such as kilograms, we can compare the numbers. If we have a dog that weighs $40$40 kilograms, and a cat that weighs $19$19 kilograms, we can compare $40$40 to $19$19. Since $40$40 is a larger number than $19$19, we can say that the dog is heavier than the cat, or that the cat is lighter than the dog.

Let's work through some examples in this video.

Careful!

When comparing mass, remember to check that you are comparing things using the same unit of measurement.

We want to compare the masses of these animals.

Cat |
Mouse |
Dog |

Which of these animals is the heaviest?

Mouse

ACat

BDog

CWhich of these animals is the lightest?

Mouse

ADog

BCat

CWhich animal is closest in mass to $10$10kg?

Cat

AMouse

BDog

C

A moth has a mass of $3$3 grams, a butterfly has a mass of $6$6 grams.

Which insect is heavier?

The butterfly.

AThe moth.

B

A local primary school had a cupcake sale and the masses of each cupcake are shown:

Cupcake | Mass (grams) |
---|---|

Banana | $91$91 |

Blueberry | $68$68 |

Mud-cake | $89$89 |

Choc-chip | $77$77 |

Which cupcake was closest to $100$100 grams?

Mud-cake

ABanana

BChoc-chip

CBlueberry

DWhich cupcake is the lightest?

Blueberry

AMud-cake

BBanana

CChoc-chip

DWhich are the two heaviest?

Banana

ABlueberry

BMud-cake

CChoc-chip

D