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I presume you don't mean 21 minus 13; that is easy enough, and equals 8. If you mean the ratio 13/21, all you do is divide. The answer is 0.1690___.
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Related questions
What is 13 plus 8?
-21
What is the ratio 13 to 21?
13:21
What is 21 over 13 as a percent?
21/13 ≈ 1.62 = 162% or work like this: 21/13 = 13/13 + 8/13 where, 13/13 is a whole which is 100% and 8/13 ≈ .62 which is 62%, so 21/13 = 13/13 + 8/13 = 100% + 62% = 162%
What is 21 - 8?
21 - 8 = 13
Write an equation for n plus 13 equals 21?
n + 13 = 21. n = 21 - 13
What is 13 sevenths of 21?
13/7 of 21 is 39.
What is 13 add 8?
21
What is the to simplest form of 13 over 21?
13/21
What is 21 p?
If p is 13 then 13-21 = -8
What is 21 times 13?
21 x 13 = 273
Find two numbers whose sum is 34 and whose difference is 8?
21 and 13.. 21-13=8 21+13=34 34/2 = 17,+4 = 21... 34-21 = 13
How does 21 24 13 and 21 equal 24?
One possibility is (21 - 21) * 13 + 24 = 24
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