SME
Grade 3 Math · Measurement & Data
Measure liquid volume and mass
Use this for “A book is 250 g and a box is 480 g. What is their total mass?”
Diagram
250 g + 480 g = 730 g
This is an example. Type your own values to start a new problem.
First mass (g)
+
Second mass (g)
=
Total mass (g)
Formulas
250 + 480 = 730
First mass + second mass = total mass
Assumptions
•
Mass is how heavy something is. Grams (g) are for light things; kilograms (kg) for heavy ones.
•
Put both things on the scale: it shows the total mass.
•
Add or subtract masses only when they use the same unit.
Step-by-step
WE KNOW
First mass: 250 g
Second mass: 480 g
FIND
total mass
Step 1 · Find total mass
250 + 480 = ?
First mass + second mass = total mass
Add the first mass and the second mass.
1
2
5
0
+
4
8
0
7
3
0
Total mass = 730 g
Check
Put the numbers back in. Both sides should match.
250 + 480 = 730 ✓
Topic check
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