利用者:Beneficii/Duck

Find the Least Common Multiple (LCM), a.k.a. Least Common Denominator (LCD).

Example: $2,3;LCD=6$

$1.\quad 3,4\,$

$2.\quad 4,6\,$

$3.\quad 3,5\,$

$4.\quad 8,12\,$

$5.\quad 4,6,12\,$

Find the Greatest Common Factor (GCF).

Example: $8,12;GCF=4$

$6.\quad 4,6\,$

$7.\quad 4,8\,$

$8.\quad 7,9\,$

$9.\quad 18,24\,$

$10.\quad 24,30,33\,$

Find the sum, express it as a mixed number, not an improper fraction, and reduce it.

$11.\quad 2{\dfrac {3}{4}}+3{\dfrac {1}{4}}\,$

$12.\quad {\dfrac {3}{4}}+{\dfrac {6}{8}}\,$

$13.\quad 1{\dfrac {2}{9}}+3{\dfrac {1}{12}}\,$

$14.\quad 2{\dfrac {4}{5}}+{\dfrac {5}{6}}\,$

$15.\quad 3{\dfrac {2}{7}}+3{\dfrac {3}{4}}+2{\dfrac {2}{5}}\,$

Find the difference, express it as a mixed number, not an improper fraction, and reduce it.

$16.\quad 4{\dfrac {3}{4}}-3{\dfrac {1}{4}}\,$

$17.\quad 5{\dfrac {3}{4}}-2{\dfrac {2}{5}}\,$

$18.\quad 4{\dfrac {5}{12}}-3{\dfrac {7}{12}}\,$

$19.\quad {\dfrac {9}{10}}-{\dfrac {7}{15}}\,$

$20.\quad 6{\dfrac {7}{12}}-2{\dfrac {2}{9}}-3{\dfrac {5}{6}}\,$