diff --git a/guide/english/mathematics/subtracting-fractions/index.md b/guide/english/mathematics/subtracting-fractions/index.md
index a5223078d0..eaf3a163b5 100644
--- a/guide/english/mathematics/subtracting-fractions/index.md
+++ b/guide/english/mathematics/subtracting-fractions/index.md
@@ -3,13 +3,16 @@ title: Subtracting Fractions
 ---
 ## Subtracting Fractions
 
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+Subtracting fractions is a bit of a misnomer, as
+```
+(a/b) - (c/d) = (a/b) + (-c/d),
+```
+so there is nothing special going on here, it is just the usual [addition](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/guide/english/mathematics/adding-fractions/index.md) of fractions. Namely,
+```
+(a/b) - (c/d) = (a/b) + (-c/d) = (a*d - b*c)/(d*b).
+```
 
+For example,
+```
+1/7 - 3/8 = (1*8 - 7*3)/(7*8) = -13/56.
+```