INTEGERS
Introduction to Negative Numbers
Rules for Working with Signed Numbers
Adding Positive and Negative Numbers - the chip model
Adding Positive and Negative Numbers - the number-line model
Adding Positive and Negative Numbers - patterns
Subtracting Positive and Negative Numbers - the chip model
Subtracting Positive and Negative Numbers - the number-line model
Multiplying Positive and Negative Numbers - chip and number-line models
Multiplying Positive and Negative Numbers - patterns and arithmetic explanation
RATIONAL NUMBERS
Finding Rational Numbers Between Two Fractions
Adding Fractions with Different Denominators
Converting Mixed Numbers and Improper Fractions
Proof for the Algorithm for Dividing Fractions
PROPERTIES OF EXPONENTS
Exponent Properties, part 3 (more about negative exponents)
RATIO AND PROPORTION
Ratio and Proportion, part 2 (triangles)