Algebra Lessons - 4
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This is a series of mathematics lessons that will review the important topics in algebra. It is presented in videos by the Portland Community College.
Math 60 - Lesson 11a
Ratio, proportions and rates
Ratio, rates and rational numbers, Proportions
Math 60 - Lesson 11b
Problem Solving with Proportions
Direct proportions, Inverse or reciprocal proportions
Proportions in geometry
Math 60 - Lesson 12a
2-dimensional geometry, Introduction to perimeter and area
Perimeter, circumference and linear units
Math 60 - Lesson 12b
Three-dimensional geometry
Introduction to volume and surface area
Volume and surface area formulas
Check out our most popular games!
Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!
Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.
Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.
Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.
Penguin Solitaire
Penguin Solitaire is a fun game that aims to move all cards to the foundations to build four full sequences. There are two versions here: Penguin (Tuxedo) and Penguin (Original).
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