Q: What are the rules for adding subtracting multiplying and dividing fractions?

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only when adding and subtracting

adding, subtracting, multiplying, dividing

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Adding, subtracting, multiplying, dividing, and measuring

No only when adding or subtracting fractions a common denominator is needed

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Same as adding, multiplying, and dividing.

Yes. When multiplying and dividing fractions your denominators do not have to be the same. The denominators only haveto be the same if you are subtracting or adding them.

only when adding and subtracting

A calculator is used for adding, subtracting, dividing, multiplying, decimals, or fractions and is also used for a lot of other uses too.

adding subtracting multiplying and dividing

adding, subtracting, multiplying, dividing

Adding and subtracting fractions can ONLY be done if the denominators are the same; then the calculation is done by adding or subtracting the numerators. Multiplying (and dividing) fractions does not require the denominators to be the same. To divide by a fraction the divisor is inverted (the original numerator becomes the new denominator and the original denominator becomes the new numerator) and then the fractions are multiplied. Multiplying fractions is achieved by multiplying the numerators together AND multiplying the denominators together. A whole number is the same as a fraction with the whole number as the numerator and a denominator of 1, so when multiplying by a whole number the denominator is multiplied by 1 (leaving it the same) and the is multiplication is effectively just multiplying the numerator by the whole number.

shape adding dividing subtracting multiplying perimeter area ratio proportion fractions algebra measurements and probably many others

You basically have to learn separately how to do different things with fractions, including finding a common denominator; converting fractions to a different denominator; simplifying fractions; adding and subtracting fractions; multiplying fractions; dividing fractions.

math is adding, subtracting, multiplying, dividing, angles and more

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it have to deal with money cents percent dividing adding and other things