diff --git a/education/math/MATH1210 (calc 1)/Derivatives.md b/education/math/MATH1210 (calc 1)/Derivatives.md
index 3ac69bf..2036ffa 100644
--- a/education/math/MATH1210 (calc 1)/Derivatives.md	
+++ b/education/math/MATH1210 (calc 1)/Derivatives.md	
@@ -66,4 +66,9 @@ $$ \lim_{h \to 0} nx^{n-1} + P_{n3} x^{n-2}*0 \cdots v * 0 $$
 
 The zeros leave us with:
 
-$$ f(x) = n, \space $f'(x) = nx^{n-1} $$
+$$ f(x) = n, \space f'(x) = nx^{n-1} $$
+# Addition/Subtraction Derivative Rule
+You can add and subtract derivatives to find what the derivative of the whole derivative would be.
+
+# Factor Derivative Rule
+$$ \dfrac{d}{dx} (f(x) * g(x)) = \lim_{h \to 0} \dfrac{f(x +h) * g(x + h) - f(x)g(x)}{h} $$