1. Place Value Through Thousandths
Lesson 1-3
ACOS N1.2

2. Numbers less than 1 can be written using decimal place value.
Key Idea
Numbers less than 1 can be written using decimal place value.

3. Place Value
A decimal is a number with a decimal point (.) . A decimal point separates the whole numbers from the part that represents part of one whole. As with whole numbers, each digit to the right of the decimal point has its own value. The place-value chart shows the names of the places.
The decimal is made up of 4 ones, 8 tenths, 5 hundredths, and 3 thousandths.

4. It’s a FACT!
Use place value to read a decimal or to determine the value of a digit in a decimal numeral. In the decimal system, each place to the left has 10 times the value of the place on its right.

5. It’s a Fact! 5 2 1 . 8 6 3 7 Hundreds Tens Ones Tenths Hundredths
Thousandths
Read as 5 2 1 . 8
521 and 8 tenths 6 3 7
62 and 37 hundredths
5 thousandths

6. Vocabulary
Tenths –
Hundredths –
Thousandths –
Equivalent decimals –

7. Decimal Points
The decimal point separates the whole number part of the decimal number from the fractional part of the decimal number.
The places to the right of the decimal point end with ths. You say tens on the left side of the decimal point, but tenths on the right side.

8. To Read a Decimal Say the whole number first if there is one.
Say “and” for the decimal point.
Say the rest of the number as a whole number.
Say the place of the last digit.
For 62.37, say: “sixty-two and thirty-seven hundredths”.

9. Equivalent Decimals
Adding a “0” to the right side of a decimal does not change its value. These numbers are equivalent to each other.
EX: = =
Adding a “0” immediately after the decimal DOES change its value. These numbers are not equivalent to each other.
EX: 0.68 > >

10. Practice Write each number in standard form:
36 hundredths _________________
3 and 5 hundredths _____________
Write the digit for each place in 1,
tens ____ tenths _____ thousandths ____
Name the place value of the digit 3 in each number.
45.3 __________ ______________
3,004 ________________

11. Ways to Write Numbers - Review
Word form: One billion, four hundred seven million, seven hundred thirty-nine thousand
Standard form: 1,407,739,000
Expanded form: 1,000,000,000
400,000,000
7,000,000
700,000
30,000
9,000

12. We will complete this together.
Group Practice
Math Workbook p. R 1-3
We will complete this together.

13. Homework Math Workbook p. P 1-3.
This will be presented and noted as completed when I check your agenda in the morning.