Idea 6of 23Builds onRead a decimal by its last place
A zero holds the place
Is 5.07 the same number as 5.7?
Today you'll discover
- what the zero in 5.07 means
- how 5.07 and 5.7 differ
- how to write a number with no tenths
Think first5.07 in a place-value chart
Are 5.07 and 5.7 the same number?
Decide first, then press Next. Look at the place each digit sits in.
A place-value chart holding 5.07, with what each digit is worth under it: 5, none, 0.07. Then 5.7, with 5 and 0.7 under it. Then the words 5 and 7 hundredths. The last step shows the words 30 and 6 hundredths with the digits hidden.
See the whole ideathe big idea and the key word, in one place
The big idea
A zero means none of that size, and it keeps the other digits in their places.
One zero, a big difference
5.07 is 5 and 7 hundredths. 5.7 is 5 and 7 tenths, which is 70 hundredths.
Easy to get wrongA zero at the END after the point, like 5.70, does not move any digit. That one can come and go.
Key word
- placeholder zero
- a 0 that says there are none of that place's size, keeping the other digits where they belong
Ready to use it?
- Write a decimal with zeros in the right places.
- Tell 5.07 from 5.7.