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2. Cross-multiplication - Wikipedia

   en.wikipedia.org/wiki/Cross-multiplication

   Note that even simple equations like = are solved using cross-multiplication, since the missing b term is implicitly equal to 1: =. Any equation containing fractions or rational expressions can be simplified by multiplying both sides by the least common denominator.

3. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   Multiplying the numerator and denominator of a fraction by the same (non-zero) number results in a fraction that is equivalent to the original fraction. This is true because for any non-zero number n {\displaystyle n} , the fraction n n {\displaystyle {\tfrac {n}{n}}} equals 1.

4. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Generalization to fractions is by multiplying the numerators and denominators, respectively: = (). This gives the area of a rectangle A B {\displaystyle {\frac {A}{B}}} high and C D {\displaystyle {\frac {C}{D}}} wide, and is the same as the number of things in an array when the rational numbers happen to be whole numbers.

5. Simple continued fraction - Wikipedia

   en.wikipedia.org/wiki/Simple_continued_fraction

   Then, multiplying the numerator and denominator of this fraction by the second quotient and adding unity to the numerator, we shall have the second fraction, ⁠ 22 / 7 ⁠, which will be too large. Multiplying in like manner the numerator and denominator of this fraction by the third quotient, and adding to the numerator the numerator of the ...

6. Unit fraction - Wikipedia

   en.wikipedia.org/wiki/Unit_fraction

   Slices of approximately 1/8 of a pizza. A unit fraction is a positive fraction with one as its numerator, 1/ n.It is the multiplicative inverse (reciprocal) of the denominator of the fraction, which must be a positive natural number.

7. Rationalisation (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Rationalisation_(mathematics)

   In elementary algebra, root rationalisation (or rationalization) is a process by which radicals in the denominator of an algebraic fraction are eliminated.. If the denominator is a monomial in some radical, say , with k < n, rationalisation consists of multiplying the numerator and the denominator by , and replacing by x (this is allowed, as, by definition, a n th root of x is a number that ...

8. Extraneous and missing solutions - Wikipedia

   en.wikipedia.org/wiki/Extraneous_and_missing...

   To begin solving, we multiply each side of the equation by the least common denominator of all the fractions contained in the equation. In this case, the least common denominator is ( x − 2 ) ( x + 2 ) {\displaystyle (x-2)(x+2)} .

9. Paolo Dagomari di Prato - Wikipedia

   en.wikipedia.org/wiki/Paolo_Dagomari_di_Prato

   2. If you wish to multiply numbers ending with a zero, multiply their figures and put all of the zeros at the end. 15. If you wish to multiply fraction by fraction, multiply the numerators with one another, and the denominators similarly. 32. If you multiply the width of a circle by 22 and divide by 7, you will have the circumference.