3/7 = 9/21 (multiplying both the numerator and denominator by 3), therefore 3 over 7 is equal to 9 over 21.
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No, because 3/4 is equal to 21/28 and 7/9 is equal to 21/27. 3/4 is less then 7/9 because of the denominator.
1/7 + 1/3 = 3/21 + 7/21 = 10/21
There are 3 feet in a yard, so 3 x 7 is 21. There are 21 feet in 3 yards, so 7 yards is greater than 18 feet.
3/4 is greater than 7/10 3/4 = 0.75 7/10 = 0.70
(20/21)/(2/3) = (20/21) x (3/2) = 10/7 = 1 and 3/7 = 1.428571429