How to find the lowest / least common denominator

Practice Questions

PSAT Math › How to find the lowest / least common denominator

Questions

4

1

Simplify:

$\frac{7}{15}+\frac{2}{3}+\frac{13}{20}$

2

3/5 + 4/7 – 1/3 =

3

3/5 + 4/7 – 1/3 =

4

$\textup{During a hike, Alexis completed }\frac{2}{5}\textup{ of a trail, took a short break, then }$

$\textup{walked another }\frac{3}{7}\textup{ of the trail. At this point, what fraction of the trail}$

$\textup{did Alexis stll have left to walk?}$

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