Mass and Volume — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In Grade 3: 450 g + 350 g = 800 g of flour.
Grade 3 students add grams when units match.
2. In Grade 3: 2000 mL - 750 mL = 1250 mL of juice.
Grade 3 learners keep mL as the same unit.
3. In Grade 3: 300 g + 250 g + 150 g = 700 g of fruit total.
Grade 3 pupils add three same-unit masses.
4. In Grade 3: 1500 mL - 600 mL = 900 mL of water remain.
Grade 3 learners subtract mL from mL.
5. In Grade 3: 5 kg - 2 kg = 3 kg of rice left in the bag.
Grade 3 students subtract kg directly.
6. In Grade 3: 400 mL + 400 mL = 800 mL of milk combined.
Grade 3 learners sum milliliters together.
7. In Grade 3: 900 g - 250 g = 650 g of sugar is left.
Grade 3 pupils subtract grams from grams.
8. In Grade 3: 250 mL + 250 mL + 250 mL + 250 mL = 1000 mL of juice.
Grade 3 learners add equal volumes to total 1000 mL.
9. In Grade 3: 6 kg + 4 kg = 10 kg of apples in total.
Grade 3 students add kilograms directly.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
500 g + 500 g (Grade 3)
→ 1000 g
1000 g
2 L - 1 L (Grade 3)
→ 1 L
1 L
750 mL + 250 mL (Grade 3)
→ 1000 mL
1000 mL
900 g - 400 g (Grade 3)
→ 500 g
500 g
Grade 3 learners match calculations to their totals.