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Pre-Algebra

All Lessons

1
Level 1
0/4
Subtracting a Positive Number From a Smaller Positive Number+15 XP
Subtracting a Positive Number From a Negative Number+15 XP
Subtracting a Positive Fraction from a Negative Fraction+15 XP
Subtracting a Positive Decimal From a Smaller Decimal+15 XP
2
Level 2
0/4
Adding a Positive Number to a Negative Number+15 XP
Adding a Negative Number+15 XP
Subtracting a Negative Number+15 XP
Additive Inverses+15 XP
3
Level 3
0/4
Real-World Addition and Subtraction+15 XP
Multiplying Positive Numbers With Negative Numbers+15 XP
Multiplying Negative Numbers+15 XP
Dividing With Negative Numbers+15 XP
4
Level 4
0/4
Equivalent Fractions With Negative Numbers+15 XP
Dividing With Negative Decimals and Fractions+15 XP
Reciprocals of Rational Numbers+15 XP
Multiplying and Dividing With Zero+15 XP
5
Level 5
0/4
Fraction of Fractions+15 XP
Divide Fractions by Fractions With Negatives+15 XP
Divisibility of Integers by 2, 5, 10, 4, and 8+15 XP
Divisibility of Integers by 3, 9, 6, and 7+15 XP
6
Level 6
0/4
Natural Numbers, Integers, and Rational Numbers+15 XP
Natural Numbers, Integers, and Rational Numbers+15 XP
Prime and Composite Numbers+15 XP
Prime Factors+15 XP
7
Level 7
0/4
Finding Greatest Common Factors Using Prime Factorization+15 XP
Finding Lowest Common Multiples Using Prime Factorization+15 XP
Prime Factorization+15 XP
Squaring Rational Numbers+15 XP
8
Level 8
0/4
Cubing Rational Numbers+15 XP
Exponents with Rational Bases+15 XP
The Zeroth Power+15 XP
Powers of Negative One+15 XP
9
Level 9
0/4
Negative Exponents+15 XP
The Product Rule for Exponents+15 XP
The Quotient Rule for Exponents+15 XP
The Power of Product Rule for Exponents+15 XP
10
Level 10
0/4
The Power of Quotient Rule for Exponents+15 XP
The Power of Quotient Rule for Exponents+15 XP
Combining the Rules of Exponents+15 XP
Writing Numbers in Scientific Notation+15 XP
11
Level 11
0/4
Converting Scientific Notation to Standard Notation+15 XP
Comparing Numbers in Scientific Notation+15 XP
Adding and Subtracting in Scientific Notation+15 XP
Addition in Scientific Notation With Different Powers of Ten+15 XP
12
Level 12
0/4
Subtraction in Scientific Notation With Different Powers of Ten+15 XP
Further Addition in Scientific Notation With Word Problems+15 XP
Dividing Numbers in Scientific Notation+15 XP
Dividing Numbers in Scientific Notation+15 XP
13
Level 13
0/4
Evaluating Rational Number Expressions+15 XP
Evaluating Expressions With Positive Integer Exponents+15 XP
Evaluating Expressions With Integer Exponents+15 XP
Evaluating Expressions With Integer Exponents+15 XP
14
Level 14
0/4
The Square Root of a Number+15 XP
Squaring a Square Root+15 XP
The Cube Root of a Perfect Cube+15 XP
Simplifying Expressions With Surds+15 XP
15
Level 15
0/4
Evaluating Radical Expressions+15 XP
Adding and Subtracting Radicals+15 XP
Rationalizing Denominators+15 XP
Square Roots+15 XP
16
Level 16
0/4
Radicals as Fractional Exponents+15 XP
The Product Rule for Radicals+15 XP
The Quotient Rule for Radicals+15 XP
The Quotient Rule for Radicals+15 XP
17
Level 17
0/4
The Quotient Rule for Radicals+15 XP
The Quotient Rule for Radicals+15 XP
Introduction to Ratios+15 XP
Equivalent Ratios+15 XP
18
Level 18
0/4
Writing Ratios Using Fractions+15 XP
Reasoning With Equivalent Ratios+15 XP
Further Reasoning With Equivalent Ratios+15 XP
Ratio Tables+15 XP
19
Level 19
0/4
Graphing Ratios+15 XP
Unit Rates+15 XP
Solving Problems Using Unit Rates+15 XP
Speed as a Unit Rate (#3593)+15 XP
20
Level 20
0/4
Solving Unit Rate Problems Using Ratios of Fractions+15 XP
Solving Unit Rate Problems Using Ratios of Fractions+15 XP
Identifying Proportional Relationships+15 XP
Proportional Relationships in the Real World+15 XP
21
Level 21
0/4
Writing and Solving Proportional Equations+15 XP
Constant of Proportionality+15 XP
Understanding Percentages Using Models+15 XP
Converting Between Percentages and Fractions+15 XP
22
Level 22
0/4
Converting Between Percentages and Decimals+15 XP
Finding Part of a Number Given a Whole and a Percentage+15 XP
Finding Part of a Number Given a Whole and a Percentage+15 XP
Finding a Percentage Given Two Numbers+15 XP
23
Level 23
0/4
Finding a Percentage Given Two Numbers: Word Problems+15 XP
Finding a Total Given a Part and a Percentage+15 XP
Finding a Total Given a Part and a Percentage+15 XP
Applying Subsequent Percentages+15 XP
24
Level 24
0/4
Applying Percentage Increases+15 XP
Applying Percentage Increases+15 XP
Applying Percentage Decreases+15 XP
Percentage Change+15 XP
25
Level 25
0/4
Finding Original Values From Percentage Increases (#6646)+15 XP
Finding Original Values From Percentage Decreases+15 XP
Introduction to Algebraic Expressions+15 XP
Constructing Algebraic Expressions+15 XP
26
Level 26
0/4
Evaluating Linear Expressions+15 XP
Evaluating Rational Expressions+15 XP
Identifying Terms in Linear Expressions+15 XP
Identifying Coefficients and Constants+15 XP
27
Level 27
0/4
The Greatest Common Factor of Two Linear Expressions+15 XP
Identifying Like Terms in Linear Expressions+15 XP
Collecting Like Terms in Linear Expressions+15 XP
Applying the Distributive Law With Linear Expressions+15 XP
28
Level 28
0/4
The Distributive Law With Three Terms+15 XP
Distributing the Negative Sign in a Linear Expression+15 XP
Simplifying Linear Expressions Using the Distributive Law+15 XP
Simplifying Linear Expressions: Minus Signs+15 XP
29
Level 29
0/4
Simplifying Linear Expressions Containing Fractions+15 XP
Simplifying Linear Expressions Containing Fractions+15 XP
Factoring Numerical Expressions+15 XP
Factoring Linear Expressions+15 XP
30
Level 30
0/4
Solving Linear Equations by Trial and Error+15 XP
Solving One-Step Addition and Subtraction Equations+15 XP
Solving One-Step Multiplication and Division Equations+15 XP
Solving Two-Step Equations+15 XP
31
Level 31
0/4
Solving Linear Equations With Fractional Coefficients+15 XP
Solving Linear Equations With Decimal Coefficients+15 XP
Solving Linear Equations With Variables on Both Sides+15 XP
Solving Linear Equations by Clearing Rational Expressions+15 XP
32
Level 32
0/4
Solving Linear Equations Using Cross-Multiplication+15 XP
Solving Linear Equations Using Cross-Multiplication+15 XP
Solving Linear Equations Using Cross-Multiplication+15 XP
Solving Linear Equations Using Cross-Multiplication+15 XP
33
Level 33
0/4
Solving Two-Variable Equations+15 XP
Linear Equations With Infinitely Many Solutions and No Solution+15 XP
Linear Equations With Infinitely Many Solutions and No Solution+15 XP
Linear Equations With No Solutions+15 XP
34
Level 34
0/4
Inequalities+15 XP
Verifying Solutions of Linear Inequalities+15 XP
Solving One-Step Inequalities+15 XP
Solving Two-Step Inequalities+15 XP
35
Level 35
0/4
Representing Solutions to Inequalities on Number Lines+15 XP
Solving Linear Inequalities+15 XP
Solving Inequalities+15 XP
The Cartesian Coordinate System+15 XP
36
Level 36
0/4
Absolute Value Distance Between Two Points+15 XP
Two-Variable Linear Equations and Their Solutions+15 XP
Graphing Linear Equations+15 XP
Equations of Horizontal and Vertical Lines+15 XP
37
Level 37
0/4
Computing Slope of Straight Lines+15 XP
Properties of Line Graphs in Slope-Intercept Form+15 XP
Introduction to Systems of Linear Equations+15 XP
Solving Systems of Equations by Substitution+15 XP
38
Level 38
0/4
Units of Area and Volume+15 XP
Points, Lines, Rays, and Segments+15 XP
Points, Lines, Rays, and Segments+15 XP
Parallel and Perpendicular Lines+15 XP
39
Level 39
0/4
Measure of Line Segments+15 XP
Congruent Segments+15 XP
Midpoints+15 XP
Collinear Points+15 XP
40
Level 40
0/4
The Segment Addition Postulate+15 XP
Angle Measurement in Degrees+15 XP
Converting Angles and Circles+15 XP
Measuring Angles Using a Protractor+15 XP
41
Level 41
0/4
Sums of Angles+15 XP
Right, Straight, Flat, and Reflex Angles+15 XP
Right, Straight, Flat, and Reflex Angles+15 XP
Right, Straight, Flat, and Reflex Angles+15 XP
42
Level 42
0/4
Acute, Obtuse, and Right Angles+15 XP
Congruent Angles+15 XP
Vertical Angles+15 XP
Solving Problems With Angles+15 XP
43
Level 43
0/4
Angles, Perpendicular Lines, and Parallel Lines+15 XP
Complementary Angles+15 XP
Non-Adjacent Complementary Angles+15 XP
Supplementary Angles+15 XP
44
Level 44
0/4
Corresponding Angles+15 XP
Alternate Angles+15 XP
Angle Criteria for Parallel Lines+15 XP
Angle Bisectors+15 XP
45
Level 45
0/4
Adjacent Angles+15 XP
Adjacent Angles+15 XP
Interior Angles of Triangles+15 XP
Interior Angles of Triangles+15 XP
46
Level 46
0/4
Interior Angles of Triangles+15 XP
Problem Solving With Angles of Triangles+15 XP
Classifying Triangles+15 XP
The Triangle Inequality+15 XP
47
Level 47
0/4
The Triangle Inequality+15 XP
The Triangle Inequality+15 XP
The Isosceles Triangle Theorem+15 XP
The Isosceles Triangle Theorem+15 XP
48
Level 48
0/4
The Isosceles Triangle Theorem+15 XP
Heights of Triangles+15 XP
Congruent Triangles+15 XP
Congruent Triangles+15 XP
49
Level 49
0/4
Polygons+15 XP
Polygons+15 XP
Interior Angles of Polygons+15 XP
Interior Angles of Polygons+15 XP
50
Level 50
0/4
Interior Angles of Polygons+15 XP
Exterior Angles of Polygons+15 XP
Regular Polygons+15 XP
The Perimeter of a Polygon+15 XP
51
Level 51
0/4
The Perimeter of a Polygon+15 XP
Classifying Quadrilaterals+15 XP
Properties of Rectangles and Squares+15 XP
Properties of Trapezoids+15 XP
52
Level 52
0/4
Area of Rectangles and Squares+15 XP
Area of Parallelograms+15 XP
Area of Parallelograms+15 XP
Area of Triangles+15 XP
53
Level 53
0/4
Area of Trapezoids+15 XP
Area of Trapezoids+15 XP
Areas of Composite Shapes+15 XP
The Area Between Two Shapes+15 XP
54
Level 54
0/4
Introduction to Statistics+15 XP
The Mean of a Data Set+15 XP
The Median of a Data Set+15 XP
The Mode of a Data Set+15 XP
55
Level 55
0/4
Range, Quartiles, and IQR+15 XP
Mean Absolute Deviation+15 XP
Mean Absolute Deviation+15 XP
Comparing Data Sets Using Measures of Centrality+15 XP
56
Level 56
0/4
Comparing Data Sets Using Range and Quartiles+15 XP
Comparing Data Using Measures of Variability+15 XP
Outliers+15 XP
Removing Outliers+15 XP
57
Level 57
0/4
Finding the Middle of a Data Set+15 XP
Comparing Data Distributions+15 XP
Frequency Tables+15 XP
Representing Data Using Dot Plots+15 XP
58
Level 58
0/4
Measuring Centrality From Dot Plots+15 XP
Symmetry, Skew, and Outliers+15 XP
Box Plots+15 XP
Comparing Data Distributions Using Histograms+15 XP
59
Level 59
0/3
Comparing Measures of Center+15 XP
Comparing Measures of Spread+15 XP
Comparing Distributions Using Statistical Measures+15 XP