Page 67 - NUMINO TG_2A
P. 67
Activity 1 Measuring to the Nearest Inch
jOb ective Understand inch as a unit of measurement.
1. Textbook Instructions Activity 1 Measuring to the Nearest Inch
Students can’t measure the eraser accurately Learn about inches.
because it is shorter than the length of a foot.
After they understand the need to use smaller This is how people measured things when they did not
units, explain “inch” as a unit of have accurate units. Can you guess what they used?
measurement.
1 inch is about the same length as the first length of the first joint of the thumb
joint of your thumb. 1 inch
1. Have students estimate the length of each This is how people started to use inches.
object using their thumbs. Then measure the
length with a ruler. 1 Guess the lengths of different objects and measure them with a
What is the length of a piece of chewing
gum using feet? ruler. What you need: Inch Ruler (A9)
A1: It can’t be measured in feet because it is
0 1 2
shorter than a foot. inch
A2: We need a shorter unit length than foot to
0 1 Place the end of the object on the 0 and read
measure the length of a piece of gum. inch the number on the notch at the other end.
Let’s measure the length of a piece of gum
with the first joint of our thumbs. How 2 About inches
many joints of your thumb does it take to
measure the piece of gum? 2. a
The length of the first joint of your thumb
is about an inch. How many inches does it Guess: About 4 inches Measure: About 4 inches
take to measure the piece of gum? About 2 b
inches.
Guess: About 3 inches Measure: About 3 inches
Guide students on how to measure properly
with a ruler. Refer to 30
2. Build Understanding
Measuring the length of objects
When measuring the length of an object, the ruler should be put parallel to the object and measured end-
to-end. The left end of the object should be lined up against the 0 mark.
For objects that are difficult to position perfectly parallel to the ruler, draw lines perpendicular to the object
on both ends. Then measure that distance between the lines.
0 1 2 0 1 2
inch inch
050 NUMINO Teacher s Guide
jOb ective Understand inch as a unit of measurement.
1. Textbook Instructions Activity 1 Measuring to the Nearest Inch
Students can’t measure the eraser accurately Learn about inches.
because it is shorter than the length of a foot.
After they understand the need to use smaller This is how people measured things when they did not
units, explain “inch” as a unit of have accurate units. Can you guess what they used?
measurement.
1 inch is about the same length as the first length of the first joint of the thumb
joint of your thumb. 1 inch
1. Have students estimate the length of each This is how people started to use inches.
object using their thumbs. Then measure the
length with a ruler. 1 Guess the lengths of different objects and measure them with a
What is the length of a piece of chewing
gum using feet? ruler. What you need: Inch Ruler (A9)
A1: It can’t be measured in feet because it is
0 1 2
shorter than a foot. inch
A2: We need a shorter unit length than foot to
0 1 Place the end of the object on the 0 and read
measure the length of a piece of gum. inch the number on the notch at the other end.
Let’s measure the length of a piece of gum
with the first joint of our thumbs. How 2 About inches
many joints of your thumb does it take to
measure the piece of gum? 2. a
The length of the first joint of your thumb
is about an inch. How many inches does it Guess: About 4 inches Measure: About 4 inches
take to measure the piece of gum? About 2 b
inches.
Guess: About 3 inches Measure: About 3 inches
Guide students on how to measure properly
with a ruler. Refer to 30
2. Build Understanding
Measuring the length of objects
When measuring the length of an object, the ruler should be put parallel to the object and measured end-
to-end. The left end of the object should be lined up against the 0 mark.
For objects that are difficult to position perfectly parallel to the ruler, draw lines perpendicular to the object
on both ends. Then measure that distance between the lines.
0 1 2 0 1 2
inch inch
050 NUMINO Teacher s Guide
