Idea 22of 22Builds onCompare in the same unit
Solve a measuring problem
How many 20 cm bows can you cut from 3 m of ribbon?
Today you'll discover
- why the units must match first
- how to share an amount into pieces
- how to check the answer
Think first3 m of ribbon, 20 cm for each bow
How many 20 cm bows can you cut from a 3 m ribbon?
Decide first, then press Next. Get both amounts into one unit first.
A ribbon drawn as a bar, 3 m. Under it, three 1 m tiles; then each metre marked 100 cm, 300 cm in all; then the bar cut into 15 numbered pieces of 20 cm. The working reads 3 m = 300 cm, 300 ÷ 20 = 15 bows. The last step shows a 2 L carton shared into 250 mL glasses.
See the whole ideathe big idea and the key word, in one place
The big idea
In a measuring problem, change to one unit first, then work out the answer.
Three steps
The same three steps work for any measuring problem.
- one unit3 m = 300 cm
- work it out300 ÷ 20 = 15
- check15 × 20 = 300
In the kitchenA recipe needs 250 mL of milk for each batch. A 1 L carton makes 1000 ÷ 250 = 4 batches.
Key word
- equal pieces
- parts of the same size cut or poured from one amount
Ready to use it?
- Solve a problem with measurements in different units.