MEASUREMENTS

Fractional/decimal equivalentsThere are several uses for equivalents for

fractions in our shop. We need to know that ½ is .500To use taps and diesTo use construction toolsTo use in metals projects during construction

Decimal Values

.500 .5= tenths .50= first 0 represents hundredths .500= second zero represents thousanths

FractionsThe fractions we will deal with are as follows:

1/8, ¼, 3/8, ½, 5/8, ¾, 7/8, 1

1/8= =.125

3/8=

.375

ONE FOURTH

¼= .250

One half Five eighths

½= .500

Five Eighths5/8= .625

Three Fourths

¾= .750

Seven Eights

7/8= .825

Whole Pie1/1= 1 any number over itself is equal to 1

Division The decimal equivalent is found in 1/8 by dividing 8 into 1

or divide 8 by one either way is correct. Your answer is ?Now take calculator and divide 1 by 8.What is your answer? Call on student.

Now how would we find the equivalent of ¼

Now let’s try doing the hand out and finish answers to the third place from decimal point.

Hand out sheet

One eighth1/8=

.125

¼= .250

Trade of Thought1/8= .125

If you add two 1/8 you get .125 +.125 = .250 = 1/4 How do I know this is correct.Divide 1 by 4 on your calculator=.250

Because if you add two eighths which is .125 +.125 = .250 or 1/4

If you add two ¼ together you get .250 + .250 = .500 or 1/2

One Half½= .500

Conclusion of HandoutHow do we find fraction equivalents?

Divide the top number by the bottom number with a calculator if you need to complete answer.

Now let’s use this in construction.The dowel is half of the thickness of the piece

of wood used.We need to put a dowel joint on a table and

legs.How do we determine the size of the dowel.

Dowel JointThe piece being used is ¾” thick the dowel

needs to be half of this dimension.

We need to use a .375 dowel or 3/8”.

Give dowel joint demonstration.Show what dowel jig looks like and how it is

centered.Show dowel center.Drill both holes according to width of boards.

Three eighths3/8=

.375

Dowel joint demoShow how to figure dowel width.Show holes in matching pieces of woodShow dowel centerShow drilling of matching holeShow dowel pinShow completed joint

How Do We Convert Fractions to Decimals

We divide The Bottom Number into the top number.

Or we divide the denominator into the numerator.

1 Numerator_8 DenominatorTake calculator and divide eight into one

= .125 1/8= .125