try to memorise this
positiveXpositive=positive
NegativeXpositive=negative
positiveXnegative=negative
negativeXnegative=positive
a - c -ac
---- 0 ----- = --------
b d bd
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The same as any two fractions. In this case, the answer will be negative.
Convert them to improper fractions and proceed. The answer will be positive.
No, you cannot use models to multiply fractions!!
When you divide by fractions, you invert and multiply.
yes. you multiply the numerator and denominator