Fractions

By Jamie

Addition and Subtraction

EXPLANATION

Adding and subtractions can be easy once you know what to do. These notes will tell you more about how to add and subtract fractions.

COMMON DENOMINATORS-ADDITION

Step 1: For a problem like 5/7 + 2/7 = ? since its denominator is 7, just add the 5 and 2, so the answer would be 7/7.

UNCOMMON DENOMETERS

Step 1: For a problem like 5/6+3/4 you first find the least common denometer, which is 12.

Step 2: Change the problem now. Since you multiplied 6 by 2 and 4 by 3 you have to multiply the numerators.

Step 3: the new equation is 10/12 + 9/12 = 19/12* You can simplfy it to a mixed number if you want*. Subtraction is exactly the same thing but just subtract the numerators.

Multiplying Fractions

Multiplying fractions in my opinion is the easiest of the fractions.

Step 1. For a problem like 1/5 x 3/7. You just multiply both numerators and denometers.

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Dividing Fractions

Dividing fractions is basically like multiplying.

Step 1: Problem- 5/7 divided by 3/4. Flip the second fraction(3/4) to 4/3. Then change the division to multiplation. Then multiply as usually. The answer is 20/21

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Multiplying Decimals

Step 1- Line up the last digit, not the decimal.

Step 2- Count how many digits are from the last one to the decimal on each number. remember it!

Step 3- Multiply as normal.

Step 4- Once you are done, put the decimal how many you did on Step 2.

Ta- Daaa! You multiplied fractions.

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Dividing Decimals

Step 1- Move the decimals in the divisor the right to make it a whole number.

Step 2- Do the same to the dividend.

Step 3- Move the decimal up to the top.

Step 4- Divide like normal.

Yay you divided decimals!!!

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