Why is it important tomeasure accurately?

Measuring in English(American Standard

System)

Using a Ruler

Where did it come from?

Why 12 inches?

The King’s Foot

One Foot

The King’s Foot

One FootToo big for some things...

...So they used the length of the King’s first knuckle

One InchBut that was too big for some other things...

Why 12 inches not 10 or 13?

Simply because it took 12 lengths of his first knuckle to equal his foot.

...So they cut the inches into fractions

1/2 1/4

...So they cut the inches into fractions

1/2 1/4 1/8 and 1/16

1 2

1 2

1 4

3 4

1 2

1 4

3 4

1 8

3 8

5 8

7 8

1 2

1 4

3 4

1 8

3 8

5 8

7 8

1 16

3 16

5 16

7 16

9 16

11 16

13 16

15 16

1 2

1 4

3 4

1 8

3 8

5 8

7 8

1 16

3 16

5 16

7 16

9 16

11 16

13 16

15 16

1 32

3 32

5 32

7 32

9 32

11 32

13 32

15 32

17 32

19 32

21 32

23 32

25 32

27 32

29 32

31 32

1 2

1 4

3 4

1 8

3 8

5 8

7 8

1 16

3 16

5 16

7 16

9 16

11 16

13 16

15 16

1 32

3 32

5 32

7 32

9 32

11 32

13 32

15 32

17 32

19 32

21 32

23 32

25 32

27 32

29 32

31 32

0.125

0.250

0.325

0.500

0.750

0.625 0.875

1/32 = 0.03125 3/32 = 0.09375 5/32 = 0.15625 7/32 = 0.21875 9/32 = 0.28125 11/32 = 0.34375 13/32 = 0.40625 15/32 = 0.46875 17/32 = 0.53125 19/32 = 0.59375 21/32 = 0.65625 23/32 = 0.71875 25/32 = 0.78125 27/32 = 0.84375 29/32 = 0.90625

1/16 = 0.0625 3/16 = 0.1875 5/16 = 0.3125 7/16 = 0.4375 9/16 = 0.5625 11/16 = 0.6875 13/16 = 0.8125 15/16 = 0.9375

The Ruler Game

•http://www.rsinnovative.com/rulergame/index.html