← Back to course
Number Trail Grade 3 / Week 09 / Wednesday
3/6
Week 09 · Time, mass and liquid volume

Wednesday

Grams and kilograms
// Minutes, grams, kilograms and liters
⏱ about 15 min

Wednesday: Grams and kilograms

The garden has a big scale for weighing the harvest.

Rosie puts one tiny bean on it. The pointer barely moves.

Bennie puts a huge pumpkin on it. The pointer swings far around.

"Why are they so different?" asks Rosie.

"The pumpkin has much more mass," says Bennie.

"Light things we measure in grams. Heavy things we measure in kilograms."

Learn it: mass, grams and kilograms

Mass tells how heavy something is.

A gram is a very small amount of mass. We write g.

A kilogram is much heavier than a gram. We write kg.

A bean or a leaf is measured in grams.

A pumpkin or a bag of soil is measured in kilograms.

Read a scale like a number line. Find what each mark means.

A scale from 0 to 500 grams with a dot at 350

Each mark is 50 grams. The dot is at 350 grams.

GRAMS OR KILOGRAMS?
  • Read the question.
  • Tap your answer.
Which unit would you use for the mass of a strawberry?
Which unit would you use for the mass of a big pumpkin?
Which unit would you use for the mass of a pencil?
Which unit would you use for the mass of a bag of garden soil?
Which unit would you use for the mass of a leaf?
READ THE SCALE
  • Read the question.
  • Tap your answer.
A scale from 0 to 500 grams with a dotHow many grams does the scale show?
A scale from 0 to 100 grams with a dotHow many grams does the scale show?
A scale from 0 to 50 grams with a dotHow many grams does the scale show?
A scale from 0 to 20 kilograms with a dotHow many kilograms does the scale show?
MASS STORY PROBLEMS
  • Read the question.
  • Tap your answer.
Rosie picks 250 grams of beans, then 175 grams more. How many grams in all?
A bag holds 600 grams of seeds. Bennie uses 240 grams. How many grams are left?
Each pumpkin has a mass of 8 kilograms. What is the mass of 4 pumpkins in kilograms?
Bennie shares 36 kilograms of soil equally into 4 pots. How many kilograms go in each pot?
FROM LIGHTEST TO HEAVIEST
  • Think about how heavy each one is.
  • Put them from lightest to heaviest.
11st
22nd
33rd
44th
SentenceTrue or false?
A kilogram is heavier than a gram.?
We measure the mass of a feather in kilograms.?
250 + 175 = 425?
36 ÷ 4 = 8?
WHY THIS EXERCISEA feather is light, so we use grams. And 36 ÷ 4 is 9.
Try it
Hold a spoon in one hand and a book in the other.
Which one has more mass?
Would you weigh each one in grams or kilograms?
If you have a kitchen scale, weigh an apple with a grown-up.
Draw two things you would weigh in grams and two in kilograms.

Super weighing! Tomorrow Chris tells a story about water and liters.

← Tuesday