Idea 5of 22Builds onCount out of the whole group
Shares as decimals
How do you write 8/20 as a decimal?
Today you'll discover
- how to make the bottom number 100
- how hundredths become a decimal
- why decimals are easy to compare
Think first8 of 20 walk: 8/20
What is 8/20 as a decimal?
Decide first, then press Next. Find what makes the bottom number 100.
Room 12's table with a fraction column: 8/20, 6/20, 4/20, 2/20, the walk row ringed. A line under it reads 8/20 = 40/100 = 0.40. Then a decimal column fills in 0.40, 0.30, 0.20, 0.10. The last step shows Room 9's pets with 8/25 ringed.
See the whole ideathe big idea and the key word, in one place
The big idea
Make the total 100: 8/20 = 40/100 = 0.40, so the walkers' share is 0.40.
Room 128/20 = 40/100 = 0.40. 6/20 = 30/100 = 0.30. 4/20 = 0.20. 2/20 = 0.10.
Easy to get wrongThe fraction bar is not a decimal point: 8/20 is not 8.20. A share is part of one group, so it is less than 1.
Key word
- hundredths
- parts of a whole cut into 100 equal parts; 40 hundredths is written 0.40
Ready to use it?
- Write a relative frequency as a decimal.
- Compare shares written as decimals.