1. Measuring SI ze

2. What is
SI?

3. (or International System of Units)
Systeme Internationale d’Unites
(or International System of Units)
Abbreviated SI
(System of International Measures)
It is the internationally accepted standard units of measure. Formerly known as…

4. The Metric System

5. The SI Base Units are… What it measures Base Unit Length Meter (m)
Mass
Kilogram (kg)
Volume
Liter (l or L or ℓ)
Time
Seconds (s)
Temperature
Kelvin (K)
Amount of a substance
Mole (mol)
Electric Current
Ampere (A)
Luminous Intensity
Candela (cd)

6. Basic units of the SI system:
Length = meters (m)
Mass = gram (g)
Volume = liter (L or l)

7. “I’m ten times better than the way you measure now!”
The SI System
“I’m ten times better than the way you measure now!”

8. Let’s see why… Fill in the blanks (do the math mentally):
13 miles = ____yards
____feet
____inches
2 1/2 gallons = ____quarts
____pints
____cups
____ounces
(22,880 yds)
(68,640 ft.)
(823,680 in)
(10)
(20 p)
(40 cups)
(320 ounces)

9. That was not the SI system!
What number is the SI system based on? SI 10

10. Let’s see why 10 is an easy base to use.

11. Multiply each of the following numbers by 10
15 x 10 =
235 x 10 =
12.4 x 10 =
43.2 x 10 =
x 10 =

12. Multiply each of the following numbers by 10
15 x 10 = 150
235 x 10 =
12.4 x 10 =
43.2 x 10 =
x 10 =

13. Multiply each of the following numbers by 10
15 x 10 = 150
235 x 10 = 2350
12.4 x 10 =
43.2 x 10 =
x 10 =

14. Multiply each of the following numbers by 10
15 x 10 = 150
235 x 10 = 2350
12.4 x 10 = 124
43.2 x 10 =
x 10 =

15. Multiply each of the following numbers by 10
15 x 10 = 150
235 x 10 = 2350
12.4 x 10 = 124
43.2 x 10 = 432
x 10 =

16. Multiply each of the following numbers by 10
15 x 10 = 150
235 x 10 = 2350
12.4 x 10 = 124
43.2 x 10 = 432
x 10 =

17. Multiply each of the following numbers by 100
15 x 100 =
235 x 100 =
12.4 x 100 =
43.2 x 100 =
x 100 =

18. Multiply each of the following numbers by 100
15 x 100 = 1500
235 x 100 =
12.4 x 100 =
43.2 x 100 =
x 100 =

19. Multiply each of the following numbers by 100
15 x 100 = 1500
235 x 100 = 23500
12.4 x 100 =
43.2 x 100 =
x 100 =

20. Multiply each of the following numbers by 100
15 x 100 = 1500
235 x 100 = 23500
12.4 x 100 = 1240
43.2 x 100 =
x 100 =

21. Multiply each of the following numbers by 100
15 x 100 = 1500
235 x 100 = 23500
12.4 x 100 = 1240
43.2 x 100 = 4320
x 100 =

22. Multiply each of the following numbers by 100
15 x 100 = 1500
235 x 100 = 23500
12.4 x 100 = 1240
43.2 x 100 = 4320
x 100 = 85356

23. Divide each of the following numbers by 10
230  10 =
4500  10 =
123.5  10 =
21.6  10 =
8.465  10 =

24. Divide each of the following numbers by 10
230  10 = 23
4500  10 =
123.5  10 =
21.6  10 =
8.465  10 =

25. Divide each of the following numbers by 10
230  10 = 23
4500  10 = 450
123.5  10 =
21.6  10 =
8.465  10 =

26. Divide each of the following numbers by 10
230  10 = 23
4500  10 = 450
123.5  10 = 12.35
21.6  10 =
8.465  10 =

27. Divide each of the following numbers by 10
230  10 = 23
4500  10 = 450
123.5  10 = 12.35
21.6  10 = 2.16
8.465  10 =

28. Divide each of the following numbers by 10
230  10 = 23
4500  10 = 450
123.5  10 = 12.35
21.6  10 = 2.16
8.465  10 = .8465

29. Divide each of the following numbers by 100
230  100 =
4500  100 =
123.5  100 =
21.6  100 =
8.465  100 =

30. Divide each of the following numbers by 100
230  100 = 2.30
4500  100 =
123.5  100 =
21.6  100 =
8.465  100 =

31. Divide each of the following numbers by 100
230  100 = 2.30
4500  100 = 45.00
123.5  100 =
21.6  100 =
8.465  100 =

32. Divide each of the following numbers by 100
230  100 = 2.30
4500  100 = 45.00
123.5  100 = 1.235
21.6  100 =
8.465  100 =

33. Divide each of the following numbers by 100
230  100 = 2.30
4500  100 = 45.00
123.5  100 = 1.235
21.6  100 = .216
8.465  100 =

34. Divide each of the following numbers by 100
230  100 = 2.30
4500  100 = 45.00
123.5  100 = 1.235
21.6  100 = .216
8.465  100 =

35. Nice Job!
If you can multiply & divide by 10 (or any power of 10), then the metric system will be easy for you.

36.  Checkpoint: Metric units are based on multiples of what number?
Multiply--Move the decimal to the right
Divide--Move the decimal to the left

37. Scientists created different sized units of measure by adding prefixes to the base units.
It’s kind of like using a cup as a basic measure and using 1/2 a cup, 1/4 of a cup, or 1/3 of a cup for the smaller measures.

38. Numerical value in Base units
Prefix
Symbol
Numerical value in Base units
Power of 10 value
Giga G
1,000,000,000
109
Mega M
1,000,000
106
Kilo- k
1000
103
Hecto- h
100
102
Deka- da 10
101
Base Unit -- 1
Deci- D
0.1
10-1
Centi- c
0.01
10-2
Milli- m
0.001
10-3
Nano n
10-9
Pico P
10-12
The SI Prefixes

39. What is length?
Length is the distance from one point to another

40. The basic unit of length in the SI system is the …
meter

41. Pause…
How big do you think a meter is?
Find something you think is a meter in length.

42. THE METER
The meter is the starting point for measuring length in the metric system.
START

43. Here’s a meter stick!

44. It takes 10 decimeters to make up 1 meter.

45. It takes 10 centimeters to make up 1 decimeter.

46. 1 decimeter = 10 centimeters,
If 1 meter = 10 decimeters
and
1 decimeter = 10 centimeters,
then how many centimeters make up 1 meter?

47. That’s right! 1 meter = 100 centimeters

48. 100centimeters = 1 meter

49. It takes 10 millimeters to make up 1 centimeter.
Boy, that’s small!

50. If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters and 1centimeter = 10 millimeters then how many millimeters make up 1 meter?

51. That’s right! 1000 millimeters = 1 meter

52. It takes 10 millimeters to make up 1 centimeter.
Millimeters are so small that they almost run together.

53. Checkpoint One centimeter is divided into how many millimeters?
10 millimeters (mm)

54. Now let’s take a closer look at some measuring devices.

55. This is a magnified image of a ruler/meter stick.1 2 3 4
This is one centimeter.

56. This is a magnified image of a ruler/meter stick.1 2 3 4
This is half of a centimeter.

57. This is a magnified image of a ruler/meter stick.1 2 3 4
This is one millimeter.

58. This key measures 3 cm. 1 2 3 4

59. Or you could say that it measures 30 mm.1 2 3 4

60. This key measures 2.5 cm. 1 2 3 4

61. Or, you could say that it measures 25 mm.1 2 3 4

62. 1 2 3 4
This toy car measures 4.2 cm.

63. 1 2 3 4
Or, you could say it measures 42 mm.

64. The metric system deals with powers of 10
1 meter =
10 decimeters =
100 centimeters =
1000 millimeters

65. How many centimeters make up 2 meters?

66. That’s right! There are 200 centimeters in 2 meters.

67. How many millimeters make up 2 meters?

68. That’s right! There are 2000 millimeters in 2 meters.

69. How many decimeters make up 2 meters?

70. That’s right! There are 20 decimeters in 2 meters.

71. The metric system really is 10 times better than our standard system of measurement. It is very easy to convert from one unit to another.

72. You must simply multiply by 10, 100, or 1000
You must simply multiply by 10, 100, or OR You must simply divide by 10, 100, or 1000.

73. The end.