# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Fractions: deciding equal value, normalizing to lowest terms with a positive denominator, and adding fractions](/en/derivations/derivation-mko-fraction-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-fraction)

(1) Decide whether (−6)/(−8) and 9/12 represent the same rational number; (2) bring (−6)/(−8) to lowest terms with a positive denominator and show that the value is unchanged; (3) compute 3/4+5/6 and show that 'numerator plus numerator over denominator plus denominator', giving 8/10, is not the sum; (4) explain why 3/0 is not a valid fraction representation.

Fraction

derivation-mko-fraction-01





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