Mass and Volume — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A Grade 3 backpack most likely has a mass of 3 grams.
Corrected: A Grade 3 backpack most likely has a mass of 3 kilograms.
Grade 3 learners estimate backpack mass in kilograms, not grams.
2. Fix the sentence:
A Grade 3 drop of water has a volume of 1 liter.
Corrected: A Grade 3 drop of water has a volume of 1 milliliter.
Grade 3 students estimate a drop as about 1 mL in size.
3. Fix the sentence:
A Grade 3 paper clip is heavier than a textbook.
Corrected: A Grade 3 paper clip is lighter than a textbook.
Grade 3 learners know textbooks weigh far more than clips.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A Grade 3 juice box holds about 200 mL of juice, which is less than a liter.
Grade 3 pupils estimate juice boxes around 200 mL.
2. A Grade 3 apple has a mass of about 150 g, much less than a kilogram.
Grade 3 students estimate an apple near 150 g.
3. In Grade 3 order, a feather is lighter than a brick when comparing mass.
Grade 3 learners order items using lighter and heavier.
4. A Grade 3 bathtub can hold around 150 liters of water when filled.
Grade 3 students estimate bathtubs at about 150 liters.
Part C: True or False?
Read each statement. Circle True or False.
1. A Grade 3 full water bottle holding 500 mL is fuller than one holding 250 mL.
True False
Grade 3 learners compare mL amounts directly.
2. A Grade 3 pencil has a mass closer to 5 kg than to 5 g.
True False
Grade 3 students estimate a pencil as about 5 g.
3. A Grade 3 milk jug is heavier when full than when empty.
True False
Grade 3 learners know full containers are heavier.