changing decimals to fractions
DESCRIPTION
Place Values .91 .912 .9 Tenths Hundredths Thousandths And so on… You will be using the place value as your denominator when we change the decimals to fractions.TRANSCRIPT
Changing Decimals to Fractions
.9 9/10
Place Values
.9
Tenths
.91
Hundredths
.912
Thousandths
And so on…
You will be using the place value as your denominator
when we change the decimals to fractions.
Step OneEXAMPLES= .4 .67
Find place value of the decimal, and write this # as
your denominator
Tenths Hundredths
10 100
Step TwoEXAMPLES= .4 .67
1) 10 100
2) 10100
467
Bring the number from the decimal and place it as the numerator for the fraction
Step ThreeREDUCE FRACTION TO LOWEST
TERMS (if possible)4 67
10 1001)
4 ÷ 2 = 2 10 ÷ 2 = 5
*Remember: Whatever you do to the numerator, you must do to the
denominator & vice versa
ALREADY IN LOWEST TERMS
YOUR TURN!!!You have 5 seconds … take out your white board, expo marker,
and felt eraser. Be ready for YOUR problem!0.75 75 ÷ 25 =
100 ÷ 25 =
0.12
34
12 ÷ 4 =100 ÷ 4 =
325
PRACTICE CONTINUED…
0.040
0.325
40 ÷ 20 =1000 ÷ 20 =
325 ÷ 25 =1000 ÷ 25 =
250
1340
TIP: Use DIVISIBILITY RULES when reducing fraction to lowest terms!
PART 2:Changing Fractions to
Decimals
.9 9/10
KEY VOCABULARYTERMINATING
DECIMAL:A decimal that ENDS
EX: 2.14REPEATING DECIMAL:A decimal # that REPEATS a pattern of
digitsEX: 2.141414… = 2.14
*Symbolized with a repeating bar over the repeating digits.
Step OneEXAMPLE= 4
Divide – numerator becomes the dividend
Denominator becomes the divisor TOP goes in the BOX
10
10 4
Step TwoEXAMPLE= 4
After setting up the division problem (TOP goes in the BOX) … ADD a DECIMAL behind the
whole # and at least two zeros
10
10 4.00
Step ThreeEXAMPLE= 4
Bring the decimal UP and mark your place holders
10
10 4.00_. _ _
Step FourEXAMPLE= 4
DIVIDE *Remember you can NEVER have a remainder when working with decimals ~ add more zeros until the # terminates or repeats (If you must round … go the hundredths place)
10
10 4.000.40
YOUR TURN!!!You have 3 seconds … take out your white board, expo marker,
and felt eraser. Be ready for YOUR problem!49
45
9 4.00 0.4 REPEATINGDECIMAL
5 4.000.8 TERMINATINGDECIMAL
If your fraction is not reduced to LOWEST TERMS … SIMPLIFY
before dividing!
1518
6 5.00 0.83 REPEATINGDECIMAL
÷3=÷3=
56
NOTE: