lesson 1: length - kyrene
TRANSCRIPT
Lesson 1: Length
T. Trimpe 2008 http://sciencespot.net/
English vs. Metric Units
Left Image: http://webapps.lsa.umich.edu/physics/demolab/controls/imagedemosm.aspx?picid=1167
Right Image: http://share.lancealan.com/N800%20ruler.jpg
Which is longer?
A. 1 mile or 1 kilometer
B. 1 yard or 1 meter
C. 1 inch or 1 centimeter
1.6 kilometers
1 mi= 1.6 km
1 mile
1 yard = 0.9444 meters
1 yd = 0.9444 m
1 inch = 2.54 centimeters
1 in = 2.54 cm
Metric Units
The basic unit of length in the metric system in the meter and is represented by a
lowercase m.
Standard: The distance traveled by light in absolute vacuum in 1⁄299,792,458 of
a second.
Metric Units
1 Kilometer (km) = 1000 meters (m)
1 km = 1000 m
1 Meter = 100 Centimeters (cm) 1m = 100cm
1 Meter = 1000 Millimeters (mm) 1m = 1000 m
Which is larger?
A. 1 meter or 105 centimeters
B. 4 kilometers or 4400 meters
C. 12 centimeters or 102 millimeters
D. 1200 millimeters or 1 meter
Click the image to
watch a short video
about the meter.
Measuring Length
Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg
How many millimeters are in 1 centimeter?
What is the length of the line in centimeters? _______cm
What is the length of the line in millimeters? _______mm
What is the length of the line to the nearest centimeter? ________cm
HINT: Round to the nearest centimeter – no decimals.
1 cm (centimeter) = 10 millimeters (mm)
1cm = 10 mm
1 decimeter (dm) = 10 centimeters (cm)1 dm = 10 cm
L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/
Find the length (antennae to feet) of the following insects to
the nearest whole or half cm:
Find the length (antennae to feet) of the following insects to
the nearest whole or half cm:
L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/
Find the lengths of the following pink lines to
the nearest mm:
Find the lengths of the following pink lines to
the nearest mm:
L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/
Complete the following conversions:
3 cm = _____ mm
15 cm = ____ mm
49 cm = ____ mm
103 cm = ____ mm
5 mm = _____ cm
19 mm = ____ cm
74 mm = ____ cm
158 mm = ____ cm
Complete the following conversions:
3 cm = _____ mm
15 cm = ____ mm
49 cm = ____ mm
103 cm = ____ mm
5 mm = _____ cm
19 mm = ____ cm
74 mm = ____ cm
158 mm = ____ cm
Complete the following conversions:
3 cm = 30 mm
15 cm = 150 mm
49 cm = 490 mm
103 cm = 1,030mm
5 mm = 0.5 cm
19 mm = 1.9 cm
74 mm = 7.4 cm
158 mm = 15.8 cm
X 10 ÷ 10
L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/
Find the lengths of the following pencils in cm & mm:
_____ cm _____ mm
_____ cm _____ mm
_____ cm _____ mm
_____ cm _____ mm
Images from http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/measures/index.htm
Find the lengths of the following pencils in cm & mm:
12.5 cm 125 mm
4 cm 40 mm
10 cm 100 mm
14.5 cm 145 mm
Images from http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/measures/index.htm
L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/
Complete the following conversions
for centimeters and meters:
1,955 cm = ___ m
178 cm = ____ m
2,299 cm = ___ m
42 cm = ____ m
1. 8 m = ____ cm
0.56 m = ____ cm
2.3 m = ____ cm
0.02 m = ____ cm
Complete the following conversions
for centimeters and meters:
1,955 cm = ___ m
178 cm = ____ m
2,299 cm = ___ m
42 cm = ____ m
1. 8 m = ____ cm
0.56 m = ____ cm
2.3 m = ____ cm
0.02 m = ____ cm
Complete the following conversions
for centimeters and meters:
1,955 cm = 19.55 m
178 cm = 1.78 m
2,299 cm = 22.99m
42 cm = 0.42 m
1. 8 m = 180 cm
0.56 m = 56 cm
2.3 m = 230 cm
0.02 m = 2 cm
÷ 100 x 100