The learner distinguishes grams as an appropriate unit for relatively light masses and kilograms as an appropriate unit for heavier everyday objects, using benchmarks and the object’s mass rather than its size alone. This understanding includes the relationship that 1 kilogram equals 1,000 grams and supports sensible estimation and interpretation of measurements; more advanced unit conversions and fractional units are not included.
Grams and kilograms are both units for measuring mass, or how heavy something is.
Remember:
Question: Would you measure a school backpack in grams or kilograms?
Step 1: Think about how heavy it is.
A backpack is heavier than a pencil or an apple. It may hold books and feel quite heavy.
Step 2: Compare it with the benchmarks.
Grams are best for light objects. Kilograms are best for heavier objects.
Step 3: Choose the unit.
A school backpack should be measured in kilograms.
Answer: A school backpack might have a mass of about 3 kilograms.
Do not choose a unit just because an object is large or small. Think about how heavy it is.
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