3/21 = 1/7
2/13
it is not equivalent
Both 21 and 9 can be divided by 3. 21/3=7 9/3=3 So 21 over 9 can be simplified to 7 over 3.
1 over 7 is the equivalent to 3 over 21.
Watts..not watz 1000 watts in a kilowatt
1/7 + 1/3 = 3/21 + 7/21 = 10/21
3/7 = 9/21 (multiplying both the numerator and denominator by 3), therefore 3 over 7 is equal to 9 over 21.
1 over 3 7/21 = 1/3
14 over 21 or 14/21 in simplest form is 2/3 or 2 over 3
1 over 21. 5/7 - 2/3 = 15/21 - 14/21 = 1/21
87/21 - 73/21 = 14/21 = 2/3
14/21 + 9/21 = 23/21