SME
Grade 3 Math
Measurement & Data
Time to the minute and elapsed time
Measure liquid volume and mass
Main lesson
Add and subtract liquid volume
Use this for liters: “3 L in the jug, pour in 4 L. How much now?”
Multiply to find a total mass
Use this for “5 bags of 3 kg each. How heavy in all?”
Compare masses
Use this for “The dog is 23 kg and the cat 5 kg. How much heavier is the dog?”
Choose grams or kilograms
Use this for “Would you measure its mass in grams or kilograms?”
Estimate liquid volume
Use this for “Does it hold more than a liter, less, or about a liter?”
Area and multiplication
Main lesson
Find an unknown side from the area
Use this when you know the area and one side: “24 cm², 6 cm long. How wide?”
Area and the distributive property
Use this to split a rectangle into two and add the areas: 6 × 8 = 6 × 5 + 6 × 3.
Area of composite figures
Use this to find the area of an L-shape made of two rectangles.
Area of a shape with a corner cut out
Use this for an L-shape: the whole rectangle take away the corner cut out.
Perimeter of polygons
Main lesson
Perimeter and unknown side lengths
Use this for “Three sides are 9 cm, 6 cm and 7 cm. The perimeter is 30 cm. How long is the fourth side?”
Same perimeter, different area
Use this for “Which rectangle has the same perimeter as this one?”
Same area, different perimeter
Use this for rectangles with the same area but different perimeters.
Perimeter of shapes with equal sides
Use this for “A sign has 8 equal sides of 12 inches. What is its perimeter?”