Idea 5of 22Builds onBenchmarks for length
Benchmarks for mass and capacity
What does one gram feel like?
Today you'll discover
- a benchmark for a gram and a kilogram
- a benchmark for a millilitre and a litre
- how to estimate a mass or a capacity
Think firstFour more things you know
Which of these has a mass of about 1 gram?
Decide first, then press Next. Picture holding each one.
Four boxes: a paper clip, a full 1 L water bottle, a teaspoon of water, a carton of milk. The first two are marked mass and the last two capacity, then their sizes: about 1 g, about 1 kg, about 5 mL, about 1 L. At the bottom, a bag of apples beside 2 water bottles: about 2 kg. The last step asks about a pail that holds 8 cartons.
See the whole ideathe big idea and the key word, in one place
The big idea
A paper clip is about 1 g and a milk carton holds 1 L: sizes to estimate with.
Four to remember
Two benchmarks for mass, two for capacity.
- paper clip1 g
- water bottle1 kg
- teaspoon5 mL
- carton1 L
Easy to get wrongBig is not the same as heavy. A pillow is big but light; a small rock can be heavier.
Key words
- gram
- a small unit of mass, written g: a paper clip is about 1 g
- millilitre
- a small unit of capacity, written mL: a teaspoon holds about 5 mL
Ready to use it?
- Estimate a mass or a capacity with a benchmark.