Welcome to Algebra: Numbers 01, version 2. This 38-page unit is a very slow introduction to natural numbers and whole numbers presented in small bite-sized chunks. Topics include natural numbers, whole numbers, odd numbers, even numbers, square numbers, triangular numbers, and a math recreation called mathemagical black hole 123.

There are 22 sets of Your Turn exercises with answers and a 17-question self-test with answers.

Algebra: Numbers 01, version 2 is available as this PDF file and also as a Microsoft Word file that you can edit.

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