EQ- How do you read a ruler accurately to 1/16 of an inch?

1
EQ- How do you read a ruler accurately to 1/16 of
an inch?

• Today you will read the power point and follow
  each step as you go.
• Be careful.
• Put your name and class on the back.
• Put in your folder

2
Following Directions Lesson

• Take out a clean sheet of notebook paper and
  something to write with.
• Place it in front of you on your desk.

3
Following Directions Lesson

• Fold your paper in half long ways hot dog style.

4
Following Directions Lesson

• Open your paper up and place it holes to the top
  on your desk.
• Draw a line all the way down the crease on the
  paper.
• DO NOT WRITE ON THE DESK!!

5
Following Directions Lesson

• Fold the paper in half the other way hamburger
  style.
• You can see my line because I used a Sharpie
  Marker and it bled through the paper.

6
Following Directions Lesson

• Open the paper up with the holes to the top.
• Draw a line from the center of the paper to the
  margin closest to you.

7
Following Directions Lesson

• Fold the paper like you had it last hamburger
  style.
• Then fold it over again in the same direction as
  you folded it last.

8
Following Directions Lesson

• Open the paper up.
• Draw a line on each of the creases half way to
  the bottom margin.
• Then fold your paper back up like you last had it.

9
Following Directions Lesson

• Fold the paper over one more time in the same
  direction as your last fold, making it even more
  slender.

10
Following Directions Lesson

• Open the paper up.
• Draw lines on the four creases half as long as
  the last lines you drew, or ¼ of the way to the
  bottom margin.

11
Following Directions Lesson

• Draw small lines on our paper in between each of
  the lines already on your paper and the left and
  right edges.
• Make the lines extend down and be half as long as
  the last lines drawn.

12
Following Directions Lesson

• Next, draw lines on the left and right edges all
  the way down below the margin, half way between
  the margin and the bottom of the paper.
• And in case you havent already figured it out,
  we are making a ruler.

13
Reading a Ruler

• Now all you have to do is count the lines as you
  go from left to right.

3
5
1
7
9
11
13
15
2
6
10
14
4
12
8
16
0
14
Reading A Ruler

• By counting you realize that you have 16 equal
  parts to an inch.
• Next you show each number as a fraction or
  portion of the total number 16.

1/16
3/16
5/16
7/16
9/16
11/16
13/16
15/16
2/16
6/16
10/16
14/16
4/16
12/16
8/16
0
16/16
15
Reading A Ruler

• Next, you must remember from math that a fraction
  should always be expressed in lowest possible
  terms.
• 1/16 for example is in its lowest form, it cannot
  be reduced any farther.
• 2/16 however, can be reduced.
• 2 is the numerator (top number in a fraction)
• 16 is the denominator (bottom number in a
  fraction)

16
Reading A Ruler

• 2/16 can be reduced by 2. This means that both 2
  and 16 are divisible by 2.
• 2 divided by 2 1
• 16 divided by 2 8
• Therefore our reduced fraction will be 1/8.

17
Reading A Ruler

• Now lets take 3/16, will it reduce?
• I bet that someone said yes!
• Some people look at the three as the numerator
  and the six in the sixteen (denominator) and
  automatically think that this fraction will
  reduce. However, it will not reduce.
• 3/16 is already in its lowest terms.

18
Reading A Ruler

• Next, lets look at 4/16. Yes it will reduce.
  There are two ways to reduce fractions like this
  one. If youre a math wiz, you might say that 4
  will go into 16. If you do, you are right. You
  can divide the numerator into the denominator.
  This is the quickest of the two ways, but you can
  divided both the numerator and the denominator by
  2, twice. You have to be careful to get
  fractions like this one into lowest possible
  terms.

19
Reading A Ruler

• The easiest way to deal with 4/16
• 4 divided by 4 1
• 16 divided by 4 4
• Your reduced fraction is ¼.

20
Reading A Ruler

• The other way to deal with 4/16 is
• 4 divided by 2 2
• 16 divided by 2 8
• Your fraction is 2/8, but is it reduced to lowest
  possible terms? NO, you have to reduce again.
• 2 divided by 2 1
• 8 divided by 2 4
• Your reduced fraction is 1/4

21
Reading A Ruler

• Now that you know how to reduce these fractions,
  you finish reducing the rest of the fractions on
  your ruler.

22
Reading A Ruler

• Now Check your fractions against these correct
  answers.

1/16
3/16
5/16
7/16
9/16
11/16
13/16
15/16
1/8
3/8
5/8
7/8
1/4
3/4
1/2
1
0
23
Reading A Ruler

• Now that you know how to use a ruler, here are
  some short cuts for you.
• As you have noticed, the lines are different
  lengths on the ruler.
• As we go across one more time pay attention to
  the line length and the denominator associated
  with it.

1/16
3/16
5/16
7/16
9/16
11/16
13/16
15/16
1/8
3/8
5/8
7/8
1/4
3/4
1/2
1
0
24
Reading A Ruler

• Did you notice a trend?
• The longest lines were of course whole numbers.

1
0
25
Reading A Ruler

• The second longest line is 1/2.

• The third longest line has a denominator of 4.

1/4
3/4
1/2
26
Reading A Ruler

• The fourth longest lines always have a
  denominator of 8.

1/16
3/16
5/16
7/16
9/16
11/16
13/16
15/16
1/8
3/8
5/8
7/8

• The shortest lines always have a denominator of
  16.

27
Reading A Ruler

• Now lets look at the whole ruler. Can you tell
  me what would be the correct measurement for the
  letter A.
• The answer is 5-7/16.
• You start at the whole number and you add the
  calculated fraction to the whole number to give
  the correct distance.

A
6
5
28
Reading A Ruler

• What is the correct measurement for the letter A.
• The answer is 10-3/16.
• What is the correct measurement for the letter B.
• The answer is 10-3/8.
• What is the correct measurement for the letter C.
• The answer is 10-3/4.

A
B
C
11
10
29
Reading A Ruler

• Now you know how to read a ruler and deal with
  the fractions involved.
• But these are measurements, and have to be
  expressed as measurements. Write the following
  notes on your paper.
• This standard ruler is to be expressed in inches
  or in. or . Example 1 ½
• 12 inches is equal to 1 foot or ft. or . Example
  4 1 ½
• Three feet is equal to 1 yard or yd.

15/16
30
Reading A Ruler

• See if you can tell the measurements of the
  objects on the following screens for a quick
  quiz.
• On the back of your paper title it Measurement
  Quiz and number from 1 to 5.

31
Measurement Quiz
1.
32
Measurement Quiz

• 2.

33
Measurement Quiz

• 3.

34
Measurement Quiz

• 4.

35
Measurement Quiz
5.
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Measurement Quiz Answers

• The answers to the quiz are
• 1. 6 - 7/16
• 2. 3 11/16
• 3. 5 5/8
• 4. 4 7/8
• 5. 11 9/16