Transcript The Delightful World of Decimals

The Delightful World of
Decimals
How to write, compare, and
order decimals
Quote of the Day
Don’t worry about
going slow, worry
about standing still.
Standard Form
• 0.234
• 10.234
Expanded form
• 0.2 + 0.03 + 0.004
• 10 + 0.2 + 0.03 + 0.004
Word Form
• If you can say then you can
write it.
• Two hundred thirty-four
thousandths
• Ten and two hundred and thirtyfour thousandths
Writing and reading
decimals
• Hint #1: Read it like a regular
number and just add the ths at
the end.
• Hint #2: In math speak we use
and to represent the decimal. In
everyday language, you may
hear people say point or dot to
represent the decimal.
Label the Decimal
• 624.3751
Comparing Decimals
• Models – use a grid
• Number line
• Line numbers up and compare
digits in each place value
Comparing
• Use symbols for greater than,
less than, or equal to
• Line numbers up and compare
digits in each place value
FYI
• Decimals are COOOOL!
• Decimals are important.
• How else would you be able to
count that cold hard cash!
millions
hundred thousands
ten thousands
thousands
hundreds
9,000,000.0
900,000.0
90,000.0
9,000.0
900.0
tens
90.0
ones
9.0
tenths
0.9
hundredths
0.09
thousandths
0.009
ten thousandths
0.0009
hundred thousandths
0.00009
millionths
0.000009
Classwork
• Text book page 11 17-33
• Text book page 16 18-21 , 24, 25
• Challenge: page 17 #28
Homework
• Workbook page 5
and
page 6 15-17
Answer this question tonight:
What is a digit?