Free eBooks by Bob Albrecht

Microsoft Word Document

Mathemagical Numbers 200 to 299 is a free 39-page booklet about the natural numbers 200 to 299. We list some of our favorite properties about each natural number 200 to 299. You will find odd numbers, even numbers, prime numbers, emirps, palprimes, composite numbers, prime factorizations of composite numbers, factors, proper factors, sums of factors, sums of proper factors, deficient numbers, perfect numbers, abundant numbers, square numbers, cubic numbers, triangular numbers, factorial numbers, Fibonacci numbers, and palindromic numbers.  You can download this booklet as a PDF file or as a Microsoft Word file that you can edit. You can add your favorite properties to the numbers 200 to 299 and have your students participate in the process. This is a free booklet, so please give copies to others.

PDF File

Mathemagical Numbers 100 to 199 is a free 39-page booklet about the natural numbers 100 to 199. We list some of our favorite properties about each natural number 100 to 199. You will find odd numbers, even numbers, prime numbers, emirps, palprimes, composite numbers, prime factorizations of composite numbers, factors, proper factors, sums of factors, sums of proper factors, deficient numbers, perfect numbers, abundant numbers, square numbers, cubic numbers, triangular numbers, factorial numbers, Fibonacci numbers, and palindromic numbers. You can download this booklet as a PDF file or as a Microsoft Word file that you can edit. You can add your favorite properties to the numbers 100 to 199 and have your students participate in the process. This is a free booklet, so please give copies to others.

Mathemagical Black Holes is a free 96-page book that you can download as a PDF file or as a Microsoft Word file. You and your students/tutees can edit the Word file, improve it, enhance it, et cetera, et cetera.

The book includes Mathemagical Black Holes of the Simple Kind, Mathemagical Black Hole 123, Mathemagical Black Holes 99 & 1089, Mathemagical Black Hole 495, Mathemagical Black Hole 6174, Mathemagical Black Hole 153, Mathemagical Square Root Black Hole, and Mathemagical Black Holes of the Cyclic Kind. We think that first-grade students can enjoy some of the simple black holes and Black Hole 123, especially with you coaching them. Black Hole 123 is amazing, and requires only counting and catenating (putting numbers together).

Grab your magic wand, hop on your broom, and explore mathemagical black holes.

PDF File

Mathemagical Numbers 200 to 299 is a free 39-page booklet about the natural numbers 200 to 299. We list some of our favorite properties about each natural number 200 to 299. You will find odd numbers, even numbers, prime numbers, emirps, palprimes, composite numbers, prime factorizations of composite numbers, factors, proper factors, sums of factors, sums of proper factors, deficient numbers, perfect numbers, abundant numbers, square numbers, cubic numbers, triangular numbers, factorial numbers, Fibonacci numbers, and palindromic numbers.  You can download this booklet as a PDF file or as a Microsoft Word file that you can edit. You can add your favorite properties to the numbers 200 to 299 and have your students participate in the process. This is a free booklet, so please give copies to others.