MG 1.3 Measure the length of an object to the nearest inch and/or
centimeter.
UNDERLYING SKILLS AND CONCEPTS:
concept of length
Measure in Centimeters and Decimeters
This ruler shows centimeters.
a
K
ey Ide
cm
1
2
3
4
5
6
7
8
9
10
There are 10 centimeters in 1 decimeter.
E x am p l E
1
One centimeter is about the width of your thumbnail.
A centimeter is smaller than an inch.
cm
1
2
3
4
5
6
7
The pencil is 7 centimeters long.
Guess to estimate.
2
How tall is the doll?
Then measure.
1
You can use centimeters to estimate.
4
2
3
E x am p l E
The doll is 4 centimeters tall.
Chapter 24 – Lesson 1
cm
B – © CSL Associates, Inc. All rights reserved.
About how many centimeters long is the pencil?
page 279
Name
P RAC T I C E
Estimate. Then use a centimeter ruler to measure and check.
1
3
About how long is your
thumb?
2
About how thick is your
book?
I estimated
I estimated
I measured
I measured
About how long is your
pencil?
4
About how wide is your
hand?
I estimated
I estimated
I measured _____________
I measured _____________
Answers will vary. Discuss strategies and exact
measures and why measures may differ.
Measure the straw to the nearest centimeter.
cm
1
2
3
4
5
6
7
8
9
10 11 12 13
12 centimeters
Math
Reasoning
6
Measurement
MR 1.2
Nick’s centimeter ruler is broken.
How can he use his ruler to measure
the length of the ticket?
How long is the ticket?
4
cm
5
6
7
Count the number of units. The ticket is about
3 centimeters long.
page 280
Chapter 24 – Lesson 1
B – © CSL Associates, Inc. All rights reserved.
5
Name
P RAC T I C E
Estimate. Then use a centimeter ruler to measure and check.
1
3
About how long is your little
finger?
2
About how thick is your
eraser?
I estimated
I estimated
I measured
I measured
About how long is your
marker?
4
About how wide is your foot?
I estimated
I estimated
I measured _____________
I measured _____________
Answers will vary. Discuss strategies and exact
measures and why measures may differ.
Measure the straw to the nearest centimeter.
cm
1
2
3
4
5
6
7
8
9
10 11 12 13
8 centimeters
Math
Reasoning
6
Measurement
MR 1.2
Travis says this ticket is 4 cm long.
Is he correct? Explain.
No. The ticket should be
measured from the 0 point of the
ruler, not the 1 cm mark.
The ticket is only 3 cm long.
page 186
Home Resource and Homework
1
cm
2
3
4
Chapter 24 Lesson 1
B – © CSL Associates, Inc. All rights reserved.
5
MCX94TEG2Ch01_30.v9.4.1 2/19/01 19:52 Page 513
Name
P RAC T I C E
Estimate. Then use a centimeter ruler to measure and check.
1
3
About how long is your
thumb?
2
About how thick is your
book?
I estimated
I estimated
I measured
I measured
About how long is your
pencil?
4
About how wide is your
hand?
I estimated
I estimated
I measured _____________
I measured _____________
Answers will vary. Discuss strategies and exact
measures and why measures may differ.
Measure the straw to the nearest centimeter.
B – © CSL Associates, Inc. All rights reserved.
5
cm
1
2
3
4
5
6
7
8
9
10 11 12 13
12 centimeters
Math
Reasoning
6
Measurement
MR 1.2
Nick’s centimeter ruler is broken.
How can he use his ruler to measure
the length of the ticket?
How long is the ticket?
4
cm
5
6
7
Count the number of units. The ticket is about
3 centimeters long.
Chapter 24 – Lesson 1
Student Book Page
page 280
Name
P RAC T I C E
Estimate. Then use a centimeter ruler to measure and check.
1
3
About how long is your little
finger?
2
About how thick is your
eraser?
I estimated
I estimated
I measured
I measured
About how long is your
marker?
4
About how wide is your foot?
I estimated
I estimated
I measured _____________
I measured _____________
Answers will vary. Discuss strategies and exact
measures and why measures may differ.
Measure the straw to the nearest centimeter.
cm
1
2
3
4
5
6
7
8
9
10 11 12 13
8 centimeters
Math
Reasoning
6
Measurement
MR 1.2
Travis says this ticket is 4 cm long.
Is he correct? Explain.
No. The ticket should be
measured from the 0 point of the
ruler, not the 1 cm mark.
The ticket is only 3 cm long.
page 186
Home Resource and Homework
1
cm
2
3
4
Chapter 24 Lesson 1
B – © CSL Associates, Inc. All rights reserved.
5