reading a straight edge created by: dr. a. dávila
TRANSCRIPT
Reading a Straight Edge
Created By:
Dr. A. Dávila
customary system
sistema tradicional
A common system of measurement used in the
United States.
La sistema de medición común utilizado en los Estados Unidos.
The distance between two points.
Es la distancia entre dos puntos.
lengthlongitud
A 12 mm
A decimal system of measurement based on the number ten. Meters, liters, grams, and the Celsius are some of the basic units of
measurement in this system.Una sistema decimal de medicíon
basado en el número diez. Metros, litros, gramos y centigrados son
algunas de las unidades básicas de medida en esta sistema.
metric systemsistema métrico
A standard measure of a quantity.
La medida estándar de una cantidad.
unitunidad
The International System (SI) basic unit for length or
distance.
La unidad de el Sistema Internacional (SI) de distancia o longitud.
meter (m)metro centimeter (cm)
centimetro
It measures 1/100 (0.01) of a meter.
Mide 1/100 (0.01) de un metro.
A fingernail is about 1
centimeter wide.
1 cm = 0.3937 in.
1 in. = 2.54 cm
millimeter (mm)milimetro
It measures 1/1000 (0.001) of a meter.
Mide 1/1000 (0.001) de un metro.
A dime is about one millimeter
thick.
Una moneda de 10¢ tiene una anchura aproximadmente un milimetro.
foot (ft)pie
It measures 12 inches.
Mide 12 pulgadas.
3 feet = 1 yard
The selected parts from a total number of equal parts which form a whole or a set.
El número que representa la partes seleccionadas de las partes iguales que forma un entero o elements en
el conjunto.
numeratornumerador
numeratornumerador
41p
inch (in.)pulgada
A unit of the customary system used to measure
length or distance.
Una unidad de la medición común que se utiliza para medir distancia o
longitud.
(1 pie)
1 inch(1 pulgada)
cm1 cm = 0.3937 in.
1 in. = 2.54 cm
part
The total number of parts that make a whole or a set.
El número total de partes que hacen un entero o un conjunto.
denominatordenominador
denominatordenominador
41
total equal parts per unit or setcantidad de partes iguales por unidad o
conjunto
Look at your straight edge closely to identify which system to use. For the customary
system, it might read in for inches or ft for feet. For the metric system, it might read cm
for centimeter or mm for millimeter.
Most straight edge rulers have an excess edge.
If it does have an excess edge, start measuring from the first mark.
Each number identifies a whole.
1 centimeter
Notice the longer line segment and its corresponding number.
whole centimeter
Notice the longer line segment and its corresponding number. This identifies the first whole centimeter.
whole centimeter
Count the number of spaces between each line segment. Each space represents a millimeter. How many millimeters make a whole centimeter?
fractions of a centimeter
Notice the first small line segment. This small line segment represents the first millimeter (on the meter side of a straight edge).
1 millimeters or 0.1 (1/10) of a cm
Notice the first small line segment. This small line segment represents the first millimeter (on the meter side of a straight edge).
2 millimeters or 0.2 (2/10 or 1/5) of a cm
Notice the first small line segment. This small line segment represents the first millimeter (on the meter side of a straight edge).
3 millimeters or 0.3 (3/10) of a cm
Notice the first small line segment. This small line segment represents the first millimeter (on the meter side of a straight edge).
4 millimeters or 0.4 (4/10 or 2/5) of a cm
Notice the first small line segment. This small line segment represents the first millimeter (on the meter side of a straight edge).
5 millimeters or 0.5 (5/10 or 1/2) of a cm
It takes 10 millimeters to make a whole centimeter.
one centimeterone millimeter
How many centimeters make a whole decimeter?
one decimeter
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
one decimeteris equal to 10 cm
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
1/10 (0.1) of a decimeter
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
2/10 or 1/5 (0.2) of a decimeter
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
3/10 (0.3) of a decimeter
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
4/10 or 2/5 (0.4) of a decimeter
It takes 10 centimeters to make a whole decimeter.
How many decimeters make a meter?
5/10 or 1/2 (0.5) of a decimeter
Count the number of spaces between each line segment. Each space represents a fraction of an inch. How many sections make a whole inch?
fractions of an inch
There are a total of 16 sections to a whole inch.
fractions of an inch
Notice the first small line segment. This small line segment represents the first fractional part of an inch.
1/16 which means 1 out of 16 sectionsor 0.0625 of an inch
2/16or 0.125 of an inch
Two fractional parts of an inch (2 out of 16 sections).
2/16 or 1/8 means (1 out of 8)or 0.125 of an inch
However, the every two sections can be combined for total of eight sections.
3/16 or 0.1875 of an inch
Three fractional parts of an inch (3 out of 16 sections).
4/16 or 0.25 of an inch
Four fractional parts of an inch (4 out of 16 sections).
However, two sections can be grouped for a total of eight sections.
4/16 or2/8 means (2 out of 8)0.25 of an inch
However, four sections can be grouped for a total of four sections.
4/16 or1/4 means (1 out of 4)0.25 of an inch
5/16 or 0.3125 of an inch
Five fractional parts of an inch (5 out of 16 sections).
6/16 or 0.375 of an inch
Six fractional parts of an inch (6 out of 16 sections).
6/16 or 3/80.375 of an inch
However, every two sections were paired for a total of 8 sections.
7/16 or 0.4375 of an inch
Seven fractional parts of an inch (7 out of 16 sections).
8/16 or 0.5 of an inch
Eight fractional parts of an inch (8 out of 16 sections).
8/16 or 4/80.5 of an inch
However, every two sections can be combined for a total of 8 sections.
8/16 or 2/4 means 2 out of 4 or0.5 of an inch
However, every four sections can be combined for a total of four sections.
8/16 or 1/2 means 1 out of 2 or0.5 of an inch
However, every eight sections can be combined for a total of 2 sections.
9/16 or 0.5625 of an inch
Nine fractional parts of an inch (9 out of 16 sections).
10/16 or 0.625 of an inch
Ten fractional parts of an inch (10 out of 16 sections).
10/16 or 5/80.625 of an inch
However, every two sections can be combined for a total of 8 sections.
11/16 or 0.6875 of an inch
Eleven fractional parts of an inch (11 out of 16 sections).
12/16 or 0.75 of an inch
Twelve fractional parts of an inch (12 out of 16 sections).
12/16 or 6/80.75 of an inch
However, every two sections can be combined for a total of 8 sections.
12/16 or 3/4 means 3 out of 4 or0.75 of an inch
However, every four sections can be combined for a total of four sections.
13/16 or 0.8125 of an inch
Thirteen fractional parts of an inch (13 out of 16 sections).
14/16 or 0.875 of an inch
Fourteen fractional parts of an inch (14 out of 16 sections).
14/16 or 7/80.875 of an inch
However, every two sections can be combined for a total of 8 sections.
15/16 or 0.9375 of an inch
Fifteen fractional parts of an inch (15 out of 16 sections).
16/16 or 1 whole inch
Sixteen fractional parts of an inch (16 out of 16 sections).
16/16 or 8/8 means 8 out of 81 whole inch
However, every two sections can be combined for a total of 8 sections.
16/16 or 4/4 means 4 out of 4 or1 whole inch
However, every four sections can be combined for a total of four sections.
16/16 or 2/2 means 2 out of 2 or1 whole inch
However, every eight sections can be combined for a total of 2 sections.
16/16 or 1/1 means 1 out of 1 or1 whole inch
All the sections form one whole inch