standard_description: Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)
problem_activity: Task
Use <, =,  or > to compare the following sums:
$\frac12 + \frac14$  ________  $\frac13 + \frac15$
$\frac13 + \frac12$  ________  $\frac13 + \frac14$


aligns: no