They are a common factor and any common factor in the numerator and denominator of a ratio can be cancelled out.
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If one unit is in the numerator and one unit is in the denominator then they can cancel out.
By dividing the numerator and denominator by their HCF
No, you must always do the same thing to both sides of an equation or to the numerator and the denominator
The simple way: multiply the numerators to get the numerator, multiply the denominators to get the denominator. To get the preferred answer cancel common factors in the new numerator and denominator. But this can be tricky.
The denominator must contain the unit that you wish to cancel in the numerator of the other number.