1-2 Decimals for Numbers Between Whole Numbers

Shanghai Golden Grand Prix 2009 - W-100m Jeter 10.64!

In the video, they measured the time it took her to run 100m. Measuring is a common and important use of numbers and counting.

What are some examples of units of measure?

Units of measure can be split into smaller parts.

Can counts be split into smaller parts? Why or why not?

In the video, the record is between _____ and _____. This is called the interval.

An interval is the distance between "tick marks."

Could this be consider a count? Why or why not?

Objective: Translate back and forth from English into the decimal system; order decimals; give a number that is between two decimals; graph and read numbers on a number line.

According to the video, we need to look at the interval between 10 and 11 seconds. To get more accurate, we split intervals into equal parts.

What is the interval on the number line?

10 2010.6

The record set by Jeter in 2007 was 10.64 seconds. Where would this be graphed on the number line above?

5 hundredths of a second

Are these true?

21.3 = 21.30

$5.00 = $5

**Adding a zero to the RIGHT of a decimal point does not affect the

value of the decimal.**

Besides keeping track of world record track times, where else do you use decimals that are not whole

numbers?

Interval Examples

1.

2. Write a number that is between 3.04 and 3.039.

3. Write a number that is between 2.53 and 2.54.

In 4 and 5, use the number line.

4.

5.

What is the interval?

How are the places to the right of the decimal point related to the places to the left of the decimal point?

Decimal Place Value Examples

Write 10 and 11 in words.

10. 0.08

11. 16.202

Comparing Decimals Examples**LINE UP DECIMAL POINTS! ADD ZEROS TO THE RIGHT AS

NEEDED!**

12. Which is larger, 3.01 or 2.999?

13. Which is larger?a. 5 or 4.99 b. .007 or .06 c.

.0025 or .002

14. Which is largest? 0.0073 0.0072940.00078

15. Which is largest?a. 1.032 1.0132 1.03

b. .0809.087 .09

c. .0086.08 .009

tonight's homework/practice

Textbook pages 13-15 #1-7all, 12-14all, 16, 17, 20-24all,

26, 27

Please complete your homework in your notebook, continuing after today's notes.