Let’s go step by step through each problem in Section B. We’ll convert units so everything is in the same unit before adding or solving.
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1) 1 m + 50 cm = ___ cm
We know: 1 m = 100 cm
So: 100 cm + 50 cm =
150 cm → Already done as example.
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2) 70 mm + 2 cm = ___ mm
Convert 2 cm to mm: 1 cm = 10 mm → 2 cm = 20 mm
Now add: 70 mm + 20 mm =
90 mm
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3) 3 kg + 200 g = ___ g
Convert 3 kg to grams: 1 kg = 1000 g → 3 kg = 3000 g
Add: 3000 g + 200 g =
3200 g
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4) 4000 m + 1 km = ___ m
Convert 1 km to meters: 1 km = 1000 m
Add: 4000 m + 1000 m =
5000 m
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5) 2 l + 900 ml = ___ ml
Convert 2 liters to milliliters: 1 l = 1000 ml → 2 l = 2000 ml
Add: 2000 ml + 900 ml =
2900 ml
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6) 6000 ml + 1 l = ___ l
Convert 6000 ml to liters: 1000 ml = 1 l → 6000 ml = 6 l
Add: 6 l + 1 l =
7 l
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7) 500 mg + ___ g = 2500 mg
First, find how many mg we need to add:
2500 mg - 500 mg = 2000 mg
Now convert 2000 mg to grams: 1000 mg = 1 g → 2000 mg =
2 g
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8) 1 tonne + ___ kg = 3 tonnes
Subtract: 3 tonnes - 1 tonne = 2 tonnes
Convert 2 tonnes to kg: 1 tonne = 1000 kg → 2 tonnes =
2000 kg
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9) ___ l + 3000 ml = 8 l
Convert 3000 ml to liters: 3000 ml = 3 l
So: ? l + 3 l = 8 l → ? = 8 - 3 =
5 l
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10) ___ m + 7 km = 10 km
Subtract: 10 km - 7 km = 3 km
Convert 3 km to meters: 1 km = 1000 m → 3 km =
3000 m
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Final Answer:
2) 90
3) 3200
4) 5000
5) 2900
6) 7
7) 2
8) 2000
9) 5
10) 3000
Parent Tip: Review the logic above to help your child master the concept of measurement worksheet grade 3.
