Idea 3of 23Builds onHundredths: each tenth cut into 10
Read a decimal by its last place
How do you say 2.57 so that its size is clear?
Today you'll discover
- what the last digit tells you
- how to say a decimal in words
- how to read a decimal less than 1
Think first2.57 in a place-value chart
Which way of saying 2.57 shows how big it is?
Decide first, then press Next. Find the place of the last digit.
A place-value chart with columns tens, ones, a point, tenths and hundredths, holding 2.57. The hundredths column is ringed and the words 2 and 57 hundredths appear under the chart. Then 0.65 is read as 65 hundredths, and the value of each digit is shown. The last step shows 24.72.
See the whole ideathe big idea and the key word, in one place
The big idea
Say the whole number, then “and”, then the part after the point counted in its last place.
Said and written
In words: 3 and 75 hundredths. In standard form: 3.75. They are the same number.
- Words3 and 75 hundredths
- Standard form3.75
Easy to get wrongMany people say “two point five seven”. That is fine for a phone number, but it hides the size. Say the unit.
Key word
- standard form
- a number written with digits and a decimal point, like 2.57
Ready to use it?
- Say a decimal in words.
- Write a decimal from its words.