The common denominator between 17/21 and 5/6 is 42, so the fractions can be rewritten as common denominators: <u>34/42 and 35/42</u>.
<h3>How to express two fractions as common denominators?</h3>
Two fractions can be expressed as common denominators by finding the lowest common multiple of the denominators in the original fractions.
For instance, the lowest common multiple of 21 and 6 is 42 because both 21 and 6 can divide 42 without a remainder. In its expanded versions, 42 is 2 x 21 and 42 is also 7 x 6.
We can then multiply the numerator and denominator 17/21 by 2 to get <u>34/42</u> and the numerator and denominator 5/6 by 7 to get <u>35/42</u>.
Thus, 17/21 and 5/6 expressed as common denominators are <u>34/42</u> and <u>35/42</u>.
Learn more about common denominators at brainly.com/question/1098206
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