Is the real number #sqrt(1.21)# rational or irrational? Algebra Properties of Real Numbers Order of Real Numbers 1 Answer Jim H Apr 9, 2015 It is rational. #1.21 = 121/100#, so #sqrt 1.21 = sqrt (121/100) = sqrt 121 / sqrt 100 = 11/10#. Which is a ratio of two integers. Answer link Related questions What are Real Numbers? What does it mean to order a set of real numbers? What are the different types of rational numbers? What kind of rational number is 0? How do you classify real numbers? How do you compare real numbers? What are examples of non real numbers? How would you categorize the number #\frac{\sqrt{36}}{9}#? Which number is larger between #\frac{\pi}{15}# and #\frac{\sqrt{3}}{\sqrt{75}}#? How would you classify each of the following numbers: #\frac{\sqrt{12}}{2}, 1.5\cdot \sqrt{3},... See all questions in Order of Real Numbers Impact of this question 8588 views around the world You can reuse this answer Creative Commons License