3rd grade · Math · Unit 6 of 14
Measuring
Length, mass and capacity
What your child practices
Measuring with centimeters and meters, grams and kilograms, milliliters and liters: choosing sensible units, estimating, comparing and solving measurement problems.
California Content Standards learning standard: 3.MD.2 · estimating and measuring liquid volumes and masses
How we explain it
Children can open this short lesson before they practice.
- Length: millimeters, centimeters, meters and kilometers.
- Mass: grams (g) and kilograms (kg).
- Capacity: milliliters (mL) and liters (L). Pick a unit that fits.
Example: Which unit fits the mass of an apple? An apple is light. Light things are measured in grams. Answer: Grams (g)
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
How many centimeters are in 2 meters?
answer box
200
Hint: 1 meter is 100 centimeters, so 2 meters is 2 × 100 = 200.
Question 2
Which is longer: 1 m or 150 cm?
- 150 cm
- 1 m
- They are the same
150 cm
Hint: Change to the same unit: 1 m = 100 cm, so 1 m = 100 cm. Now compare 100 cm with 150 cm.
Question 3
About how tall is a classroom door?
🚪- 2 m
- 2 cm
- 20 m
2 m
Hint: A door is a bit taller than a grown-up, but much shorter than a house: about 2 m.
Question 4
About how much water does a bucket hold?
🪣- 10 L
- 100 L
- 10 mL
10 L
Hint: A bucket holds lots of water, so use liters: about 10 L.
Question 5
A sunflower is 37 cm tall. It grows 10 cm more. How tall is it now?
🌻answer boxcm
47 cm
Hint: Add: 37 + 10 = 47 cm.
Question 6
Which unit would you use to measure how much a bucket holds?
🪣- liters
- milliliters
- grams
liters
Hint: Milliliters are for small amounts, like a spoonful. Liters are for big amounts, like a bucket of water. 1 liter is 1000 milliliters.