Transcript Comparing and Rounding Decimals

Comparing and
Rounding Decimals
Christine Berg
Edited V Hamilton
Decimal Places
 1000
 100
 10
1
 0.1
 0.01
 0.001
 0.0001
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thousand
hundred
ten
one
tenth
hundredth
thousandth
ten-thousandth
Reading Decimals
Step 1:
Read the number
before the decimal
point
Reading Decimals
Step 2.
Read the decimal
point as “and”
Reading Decimals
Step 3:
Read the number
after the decimal
place
Reading Decimals
Step 4:
Follow the second
number with the
place value of the
last digit Hint
Reading Decimals
Hint
.05
Draw and imaginary
line underneath
Reading Decimals
Hint
.05
Place a 1 under the decimal
Place zeroes under each of the
following numbers
. 05
100
Reading Decimals
. 05
100
is read as five
hundredths
Comparing Decimals
• Decimal
Models
• Equivalent
Decimals
• Number Line
Decimal Models
Tenth
Hundredth
Equivalent Decimals
• Decimals
that represent
the same value
• Example:
0.6 is equivalent to 0.60
0.6 = 0.60
Terminal Zeroes
• Zeroes
as last
digit(s) of a number
can be removed
0.6 = 0.60
Equivalent Decimals
0.6
0.60
Comparing Decimals
Step 1:
Underline the first
number that is different
in the numbers being
compared
Comparing Decimals
Step 2:
Add terminal zeros so
there are the same
number of decimal
places
Comparing Decimals
Step 3:
Remove the
decimal point
Comparing Decimals
Step 4:
Order numbers
depending on the
directions given
Comparing Decimals
Step 5:
Replace decimal point
and remove terminal
zeroes
Which is greater:
0.6 or 0.58 ?
0.60
0.58
0.6 > 0.58
Which is greater:
0.6 or 0.58
0.6
0.58
Rounding Decimals
Step 1:
Underline decimal
place we are
rounding
Rounding Decimals
Step 2:
Circle the number to
the right of the
underlined decimal
place
Rounding Decimals
Step 3:
If circled digit is greater
than or equal to 5, then
round the underlined
number up (add one)
Rounding Decimals
Step 4:
If circled digit is less
than or equal to 4,
leave the underlined
number the same
Rounding Decimals
Try these:
1)Round 1.05 to the
nearest tenth
2) Round 0.123 to the
nearest tenth
Rounding Decimals
Answers:
1) 1.1
2) 0.12
In your Own Words
Describe what you
learned today about
either reading OR
rounding decimals.