multiply denominator by denominator and vice versa
you do not do that
None. Multiply numerator by the numerator and denominator by denominator.
You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.
When you multiply fractions just line them up (denominator and denominator, numerator and numerator) then multiply across. Simplify.
multiply denominator by denominator and vice versa
Yes you do.
No.
you do not do that
No.
None. Multiply numerator by the numerator and denominator by denominator.
No.
You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.
When multiplying fractions you multiply the numerator to the numerator and the denominator to the denominator. For example: 2/3 x 4/5 = 2x4/3x5
When you multiply fractions just line them up (denominator and denominator, numerator and numerator) then multiply across. Simplify.
It is easier to multiply or divide fractions than to add or subtract fractions because in multiplication, you just have to multiply the numerator by the numerator and the denominator by the denominator. Same applies with division of fractions, except that you have to reciprocate the fraction you're dividing with (divisor) then proceed to multiplication. Whereas, in addition and subtraction of fractions, you still have to get their Least Common Denominator (LCD).
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.