Converting Units of Weight/Mass for 4th Grade
To convert units of weight or mass, multiply when moving to a smaller unit and divide when moving to a larger one. Customary units use sixteen ounces to a pound; metric units scale by ten. The examples below cover both systems, with practice problems.
DETAILED EXPLANATION
Customary weight: ounces (oz), pounds (lb). 16 oz = 1 lb. Metric mass: grams (g), kilograms (kg). 1,000 g = 1 kg. Convert by multiplying or dividing.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
How many ounces in 2 pounds?
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 2 lb × 16 oz/lb = 32 oz.
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