Return to site

Pre-Algebra Skills

Math 20:








Math 20 Videos

(recorded Spring 2018 at Clackamas Community College)

I hear a lot about Math Anxiety and for that I love to recommend this video:

Math Anxiety:

My Mom Beth Josi is a motivational Speaker and she has been giving this seminar to help people my whole life: Winnervision (A video by Beth Josi to help motivate! Growth Mindset stuff):

I made these videos of my class lessons from a Math 20 class I taught.


Divisibility Rules:

Times Tables Fill In The Blank (handout)

The Product Game for learning Times Tables:

The Product Game Board (handout)

Game 24:

Order of Operations:

Primes vs. Composite:

Sieve of Eratosthenes (handout)

Prime Factorization:

Factor Trees:

Factor Rainbows:


Fraction Strips:

Fractions Strips (handout)

Equivalent Fractions:

Equivalent Fractions and Adding Fractions:

Mixed Numbers & Improper Fractions:

Equivalent Fractions & Cross Products:

Multiplying Fractions:

Dividing Fractions:

Multiplying and Dividing Fractions:

Adding Fractions:

Adding Fractions:

Change mixed numbers to improper fractions before we multiply or divide:


Scientific Notation:

Decimals Part 1:

Decimals Part 2:


Area, perimeter, and volume:


Irregular Shapes:


Circles Part 2:

Pythagorean Theorem:

Integer Operations:

The Real Numbers

Adding Integers:

Subtracting Integers:

Multiplying & Dividing Integers:


Data, Mean, Median, Mode:

All Posts

Almost done…

We just sent you an email. Please click the link in the email to confirm your subscription!