My Math Chapter 1

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PLACE VALUE
 Standard

form: 804,932,008
*Each group of three digits is called a period and is
separated by a comma
 Word
form: eight hundred four million, nine
hundred thirty-two thousand, eight


*When you get to the comma, say the period
*
 Expanded
form: 8 x 100,000,000 + 4x 4,000,000
+ 9x 100,000 + 3 x 10,000 + 2 x 1,000 + 8

*Split up the number using place value. For example,
an 8 in the hundred millions place equals 8 x
100,000,000.
•
You can line up the numbers to compare
•
Example:
76,552



Ο
76,852
76,552
76,852
76,552 < 76,852
5<8
so



Examples:
7
17
10
= 0.7
= 0.017
54
100
= 0.54
1,000

Word form

1. Say the decimal as a whole number
fifty-five

0.55

Label the place value. In what column does the
number end?
hundredths

Word form is fifty-five hundredths
2.

Standard form
thousandths

1. What is the place value?
Thousandths = 0. __ __ __


Place the numbers to the right
0. 0 2 7

Standard form is 0.027
2.
twenty-seven

Expanded form

Multiply each number by it’s place value.

0.95
0.95 = (9 x 1/10) + (5x 1/100)
•
You can line up the numbers to compare
•
Example:
0.592

Ο
0.512
0.592
0.512


0.592 > 0.512
9>1
so
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