Pre-algebra lessons

Prerequisites

1. Basic operations
2. Introduction to number theory
3. Greatest common factor
4. Counting factors
5. Least common multiple
6. Prime number 
7. Prime numbers chart
8. Divisibility rules
9. Number theory test
10. How to use a four-function calculator

Whole numbers

1. Whole numbers
   
2. Ways of writing whole numbers
3. Place value
4. Place value chart
   
5. Reading and writing whole numbers
   
6. Adding whole numbers
7. Subtracting whole numbers
8. Multiplying whole numbers
9. Lattice method for multiplication
10. Multiply using partial quotients
11. Russian peasant multiplication
12. Duplication algorithm for multiplication
13. Dividing whole numbers
14. Divide using repeated subtraction
15. Divide using partial quotients
16. Estimate quotients using multiples
17. Use counters to find the quotient and remainder
18. How to interpret the remainder
19. Finding the average
20. weighted mean
21. Harmonic mean
22. Even and odd numbers
    

Fractions

1. Introduction to fractions
2. Types of fractions
3. Comparing fractions
4. Adding fractions
5. Adding mixed numbers
6. Subtracting fractions
7. Multiplying fractions
8. Multiplying mixed numbers
9. Dividing fractions
10. Complex fractions
11. How to estimate fractions
    
12. Rounding fractions

Decimals

1. Introduction to decimals
2. Equivalent decimals
3. Ways of writing decimals
4. Decimals place value
5. Writing decimals in words
6. Comparing decimals 
7. Rounding decimals
8. Adding decimals
9. Subtracting decimals
10. Decimals to fractions
11. Fractions to decimals
12. Converting repeated decimals to fractions

Ratio and proportion

1. Introduction to ratio and proportion
2. Ratios
3. Difference between a ratio and a fraction
4. Proportions
5. Solving proportions
6. Scale drawings
7. Working together word problems
8. What is the golden ratio?

Percentage

1. Introduction to percents
2. Meaning of percent
3. Finding a percentage
4. Formula for percentage
5. Percent to decimal 
6. Decimal to percent
7. Percent of increase
8. Percent of decrease
9. Greatest possible error
10. Calculate sales tax
11. Simple interest
12. Price discount
13. Mortgage loans

Basic number properties

1. Introduction to number property
2. Commutative property
3. Associative property
4. Distributive property
5. Properties of zero
6. Identity property of multiplication
7. Properties of equality
8. Properties of inequality
9. Density property
   

Rounding and estimating

1. Introduction to rounding and estimating
2. Rounding whole numbers
3. Estimating a sum
4. Front end estimation
5. Compatible numbers
6. Cluster estimation

Measurements

1. Measurement benchmarks
2. Metric measurement
3. Metric conversion
4. Metric conversion factor
5. Conversion between metric units

Types of Graphs

1. Types of graphs
2. Bar graphs
3. Double bar graphs
4. Line graphs
5. Circle graphs
6. Scatter plots

Brain teasers

 Basic math puzzles

 Fun online math games
 A very interactive way to learn math and have fun at the same time.

 Basic mathematics games
 More interactive math games

 Cool math tricks
  Learn to solve arithmetic problems fast

Interesting and challenging pre-algebra topics

Amicable numbers

Deficient numbers

Comparison word problems

Units of time

Perfect numbers

Finger multiplication

Classification of numbers

Learn how arithmetic was done in the past

History of fractions

Math problem solving strategies

Common mistakes in math

Direct variation

Inverse variation

Convert square feet to acres

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Formula for percentage

Types of angles

Area of ​​irregular shapes

Math problem solver

Math skills assessment

Compatible numbers

Surface area of ​​a cube