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If you have a missing numerator (top number), divide the new denominator (bottom number) by the original denominator and multiply this by the numerator.

If you have a missing denominator, divide the new numerator by the original numerator and multiply this by the denominator.

examples:

  • 1/2 = ?/6
Dividing denominators: 6 ÷ 2 = 3

Multiplying the numerator: 1 x 3 = 3

⇒ 1/2 = 3/6

  • 1/4 = 3/?
Dividing numerators: 3 ÷ 1 = 3

Multiplying the denominator: 4 x 3 = 12

⇒ 1/4 = 3/12

  • 6/8 = ?/4
Dividing denominators: 4 ÷ 8 = 1/2

Multiplying the numerator: 6 x 1/2 = 3

⇒ 6/8 = 3/4

  • 3/6 = 2/?
Dividing numerators: 2 ÷ 3 = 2/3

Multiplying the denominator: 6 x 2/3 = 4

⇒ 3/6 = 2/4

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13y ago

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