Idea 19of 22Builds on4 × 1/3 and 4 ÷ 1/3 ask different questions
Ribbon for 5 bows
Each bow uses 1/4 m of ribbon. How much do 5 bows use?
Today you'll discover
- how a measuring story becomes 5 × 1/4
- how to give the answer in metres
- why the answer is less than 5 m
Think first5 bows, 1/4 m of ribbon each
Each bow uses 1/4 m of ribbon. How much ribbon do 5 bows use?
Decide first, then press Next. Each tinted piece is one bow's ribbon.
Ribbon: each bow uses 1/4 m. Five quarter-metre pieces slide together into bars labelled 1 m and are counted 1/4 to 5/4. Four fill the first metre; one sits in a dashed second metre. Then 5 × 1/4 = 5/4 = 1 1/4. The last step shows 5 thirds of a cup of trail mix.
See the whole ideathe big idea and the key word, in one place
The big idea
5 bows at 1/4 m each use 5 × 1/4 = 5/4 m, which is 1 1/4 m.
Easy to get wrongCheck the size: each bow uses less than 1 m, so 5 bows use less than 5 m. An answer of 20 m cannot be right.
Key word
- metre
- a unit of length; 1 m is 100 cm, about one big step
Ready to use it?
- Solve a measuring story that multiplies by a unit fraction.