diff --git a/SUMMARY.md b/SUMMARY.md
index cfe6974c22550930d53fa3f1a0ca538cf79c5613..305895f65839dadf0b8ffd64aa41f7e9d2444b04 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -48,22 +48,6 @@
     * [Lists and List-Operations](./1-04-0-lists.md)
     * [Extra Credit: Look-up Lists and Trees](./1-05-0-lookups-trees.md)
     * [Numbers and Math](./1-06-0-math.md)
-        * [Integers](./1-06-01-integers.md)
-        * [More Integers](./1-06-02-more-integers.md)
-        * [Hexadecimal Integer Notation](./1-06-03-hexadecimal-notation.md)
-        * [Octal Integer Notation](./1-06-04-octal-notation.md)
-        * [Binary Integer Notation](./1-06-05-binary-notation.md)
-        * [Ratios and Rational Numbers](./1-06-06-ratios.md)
-        * [Floating-point Numbers](./1-06-07-floating-point.md)
-        * [Numeric Constants](./1-06-08-constants.md)
-        * [Complex Numbers](./1-06-09-complex-numbers.md)
-        * [Arithmetic](./1-06-10-arithmetic.md)
-        * [More Arithmetic](./1-06-11-more-arithmetic.md)
-        * [Even More Arithmetic](./1-06-12-even-more-arithmetic.md)
-        * [Exponents](./1-06-13-exponents.md)
-        * [Logarithms](./1-06-14-logarithms.md)
-        * [Trigonometry](./1-06-15-trigonometry.md)
-        * [Pseudo-Random Numbers](./1-06-16-psuedorandom-numbers.md)
     * [Extra Credit: Arrays and Vectors](./1-07-0-arrays.md)
     * [Variables, Parameters, and Constants](./1-08-0-variables.md)
     * [Extra Credit: Closures](./1-09-0-closures.md)