Benchmark 6.2.7
Locate rational numbers on a
number line.
~ locate decimal numbers on a
number line
Who needs to
locate decimal
numbers on a
number line?
Machinists and other skilled
workers use decimal rulers to
make measurements!
Some use Vernier Calipers
Some use hundredth
scales.
This makes their
measurements
very accurate.
You can also put decimals on a
number line to compare and
order them.
Decimals
As you read a typical number line
from left to right, the decimals will
become greater, and get closer to
the next whole number.
We can use place value to
locate our decimals on
the number line.
To do that, we must
look at the intervals on
the number line.
Intervals show place value
?
What if two numbers
have different place
values?
Example: 0.7 and 0.53
The easiest way to fix that is to
add zeros to make your decimal
numbers have the same place
value.
Remember! Adding on zeros
will NOT change the value of
your decimal number!
Add a 0 to 0.7 = 0.70
.70 is larger than .53, so it will
come after 0.53 on the number
line.
0.53
0.70
Now, let’s try to
locate some
decimal numbers
on a number line!
What number does point N
represent on the number line
below?
Remember to look at the
intervals!
Correct!
2.6
What number does point S
represent on the number line
below?
Correct!
4.8
What numbers are represented
by the letters A, B, and C?
A
B
A = 4.81
B = 4.93
C
C = 5.04
Now, let’s do some
independent practice!
Turn to page 2 in your
handout!