Standard and Metric
Measuring
Review the Basics
Two measuring systems.
Standard or Customary System (Inches)
 Based on Whole Numbers and Fractional parts of
Metric or International System (Millimeters, Centimeters)
 Based on the Power of 10
Steps in Using the
Standard System
1. Find out how many parts the inches are divided into.
Count the spaces in 1 inch.
This number will be the denominator.
2. Count the number of whole inches.
Write down the number.
3. Count the number of spaces after the last whole inch.
This number will be the numerator.
4. Reduce fraction, if necessary.
Hint: If the numerator is a odd number it is reduced.
Summary Review
What to remember about the Standard/ Customary System
Halving or doubling units.
Number of units between Whole number 8, 16, 32, or 64
Fractions used – 1 / 16, 1 / 8, 1 / 4, 1 / 2
Can count each line and reduce the fraction
Count line patterns (1 / 8”, 1 / 4”).
Don’t forget the whole number.
What type of Ruler do we have?
Standard or Metric? Don’t know?
Count the number of lines between whole
numbers.
1
0
2
5
3
4
6
7
9
8
1
13
15
10 1
14
12
1
16
So what type of Ruler do we have?
Standard
A ruler that measures in 16ths of an inch.
1
0
2
5
3
4
6
7
9
8
Did you
know that
8, 16, 32
and 64 are
doubling
units?
1
13
15
10 1
14
12
So if you count 8, 16, 32 or 64 lines on
other rulers you will still be in the
STANDARD SYSTEM FOR MEASURING.
1
16
What is the measurement of
each line, reduced?
1/16 3/16
2/16
1/8
0
5/16
4/16
2/8
1/4
7/16
9/16 11/16 13/16 15/16
6/16
3/8 8/16
4/8
2/4
1/2
10/16
14/16
5/8 12/16 7/8
6/8
3/4
16/16
8/8
4/4
2/2
1
Let’s measure!
1/8, 5/16, 5/8, 13/16
1/8
2/16
0
5/16
5/8
10/16
13/16
1
Steps in Using the
Metric or International System
1. Count the number of whole centimeters (cm).
These are the longer lines with numbers on the ruler.
2. Count the number of lines after the whole number.
The smaller lines on the ruler, which are millimeters (mm).
3. Put measurement in correct terms.
Are you measuring in mm or cm
?
Summary Review
What to remember about the Metric
System:
Each line is a millimeter and every 10
lines is a centimeter.
Every 100cm = 1 meter.
What type of Ruler do we have?
Standard or Metric? Don’t know?
Count the number of lines between whole
numbers.
1 2 3 4 5 6 7 8 9 10
0
The zero mark
for this ruler is
the edge.
Always check to
find the zero
mark.
1
2
3
So what type of Ruler do we have?
Metric
A ruler that measures in mm and cm.
1 2 3 4 5 6 7 8 9 10
0
The zero mark
for this ruler is
the edge.
Always check to
find the zero
mark.
1
2
3
What is the measurement of
each line, in mm?
What is each line in cm?
1mm = 0.1cm 2mm = 0.2cm 3mm = 0.3cm 4mm = 0.4cm 5mm = 0.5cm
6mm = 0.6cm 7mm = 0.7cm 8mm = 0.8cm 9mm = 0.9cm 10mm = 1cm
3mm
1mm
2mm
7mm
5mm
4mm
6mm
9mm
8mm
10mm
0
1
2
3
Let’s measure!
7mm, 1.3cm, 23mm, 2.7cm
1.3cm
7mm
0
1
23mm
2
2.7cm
3
End of Measuring Review
• It’s time to get ready for the test.
• What questions do you have?