Fractions, Decimals, Percents
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3Fractions, Decimals, Percents
DecimalPercent
PercentDecimal
*Move the decimal point 2 places to the right
*Move the decimal point 2 places to the left
(multiply by 100)
(divide by 100)
Decimal → Fraction
FractionDecimal
* Numerator Denominator
Say the decimal the right way, write the fraction and simplify if
needed.
Percent → Fraction
FractionPercent
Percent means “out of 100” – Put the percent over 100 and simplify.
*Change the denominator to 100
OR
* Numerator ÷ Denominator X 100
Decimals
Rounding Decimals
Comparing Decimals
1. Find the digit in the place you are rounding to.
Begin by comparing the whole numbers (to the left of
the decimal point)
Compare the digits – place by place – starting with the
2. Look at the number to its right. If this number is less than 5, keep
the digit the same. If this number is 5 or greater, round the digit up.
tenths place
3. Keep all numbers to the left of your place the same.
Adding and Subtracting
4. All numbers to the right become 0.
Be sure to line up the decimal point.
Multiplying Decimals
Dividing Decimals
If you are not dividing by a whole number, move
To multiply decimal numbers:
decimal point to right to make it a whole number and
move decimal point under the division sign the same
**Multiply the numbers just as if they were whole numbers.
number of places.
Line up the numbers on the right - do not line up the decimal
Put decimal point directly above decimal point in the
points.
dividend.
Place the decimal point in the answer by starting at the right and
moving a number of places equal to the total of decimal places
Divide as usual. Keep dividing until the answer
in both numbers multiplied
terminates or repeats.
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