Whole Numbers and Decimals

1
Whole Numbers and Decimals

• Lesson 1.1

2
Place Value Chart
3
This chart can be broken into groups of three
called periods
4
How to Read a Large Number

• Numbers are grouped in sets of three (each set is
  called a period).
• Only read three numbers at a time.
• Say the name of the place the third number is in.
• Say and for the decimal, but do not say and
  if there isnt a decimal.

5
Example
4,658,089

• The 4 is in the millions place, and it is the
  only digit in the millions period.
• 658 is in the thousands period (it ends in the
  thousands place)
• 089 is in the ones period. 089 is the same is
  89, so we just say eighty-nine.

Four million, six hundred fifty-eight thousand,
eighty nine.
6
Example 2
625,409.36

• 625 is in the thousands period (the 5 is in the
  thousands place).
• 409 is in the ones period.
• Now we have a decimal! Say and at the decimal.
• Now, read the whole number after the decimal. 36
  is read thirty-six.
• What place is the six in? Thats right, the
  hundredths place. Say hundredths.

Six hundred twenty-five thousand, four hundred
nine and thirty-six hundredths.
7
What is the value of the 4?

• There are two ways to answer questions like
  these.
• Write 4, followed by the place that the 4 is in.
• Write the value of 4, which you find by
  multiplying 4 times the place its in.

542

• 4 tens
• 40 (we get 40 by multiplying 4 times 10)

8
What is the value of the 7?
560.27
7 hundredths
0.07
OR
9
Standard Form
Standard Form means write it like a regular
number.
Four hundred sixty five million, nine hundred
eleven thousand, twenty-six.
REMEMBER Numbers are grouped in periods, so
only deal with three numbers at a time. The
commas in the words become the commas in the
number.
465,911,026
The ones period should always have three digits
in it. Since twenty-six is only a two digit
number, we make it 3 digits by writing 026.
10
Try another one
Thirteen and twenty-five hundredths
This one has and which means it has a ________
decimal.
Write the number before and. Put a decimal
where the and is. Now, look at the last word.
How many spaces do you need? Fill in those
spaces with the number twenty-five.
13.25
11
Thats It!
You have done 2 examples of each type of problem.
Now youre ready to start the homework!