Adding and subtracting with like denominators Knowledge-Based Practice

Questions

1. 1.

   What is the result when $\frac{8}{21}$ is subtracted from the sum of $\frac{11}{21}$ and $\frac{16}{21}$?

   • A) $\frac{19}{21}$
   • B) $\frac{35}{21}$
   • C) $\frac{17}{21}$
   • D) $\frac{13}{21}$
2. 2.

   What is the value of the expression $\left(\frac{15}{19} + \frac{9}{19}\right) - \left(\frac{7}{19} + \frac{6}{19}\right)$?

   • A) $\frac{11}{19}$
   • B) $\frac{23}{19}$
   • C) $\frac{13}{19}$
   • D) $\frac{7}{19}$
3. 3.

   What is the value of the expression $\frac{19}{25} - \left(\frac{12}{25} - \frac{4}{25}\right)$?

   • A) $\frac{3}{25}$
   • B) $\frac{11}{25}$
   • C) $\frac{15}{25}$
   • D) $\frac{27}{25}$
4. 4.

   Which fraction replaces the square to make the equation $\frac{17}{20} - \Box = \frac{3}{20} + \frac{6}{20}$ true?

   • A) $\frac{26}{20}$
   • B) $\frac{10}{20}$
   • C) $\frac{8}{20}$
   • D) $\frac{8}{40}$
5. 5.

   What is the value of $\frac{13}{17} - \frac{8}{17} + \frac{4}{17}$?

   • A) $\frac{9}{17}$
   • B) $\frac{1}{17}$
   • C) $\frac{9}{51}$
   • D) $\frac{17}{17}$

Answers and step-by-step solutions appear after you finish the test.