1
Understand
Learn what the idea means and why mathematicians needed it.
HOW THIS COURSE TEACHES
Understanding comes before memorizing.
2
See It Work
Follow worked examples where every important step is explained.
3
Use It
Connect arithmetic to money, motion, science, construction, computers and everyday problems.
4
Practice
Work problems yourself with progressive hints when you need help.
5
Get Tutored
Ask the local AI tutor to explain anything another way.
6
Prove Mastery
Use practice tests and exams to find what you know and what needs review.
COMPLETE COURSE
Beginner Foundations → Advanced Arithmetic
Follow the course from Unit 1 or jump directly to a subject you are studying in school.
UNIT 1
Numbers and Place Value
Understand how our number system works and how quantities are represented.
UNIT 2
Addition
Understand addition as combining quantities and measuring increases.
UNIT 3
Subtraction
Understand subtraction as difference, removal and comparison.
UNIT 4
Multiplication
Understand multiplication as repeated groups, scaling and area.
UNIT 5
Division
Understand division as sharing, grouping and rates.
UNIT 6
Factors, Multiples and Primes
Learn the building blocks of whole numbers.
UNIT 7
Fractions
Understand fractions as numbers, parts, ratios and division.
UNIT 8
Multiplying and Dividing Fractions
Use fractions in scaling, sharing and measurement.
UNIT 9
Decimals
Connect decimal notation to place value, fractions and measurement.
UNIT 10
Percentages
Understand percent as parts per hundred and use it in everyday life.
UNIT 11
Ratios, Rates and Proportions
Compare quantities and understand how rates describe the world.
UNIT 12
Signed Numbers
Work confidently with positive and negative quantities.
UNIT 13
Powers, Roots and Scientific Notation
Handle repeated multiplication and extremely large or small quantities.
UNIT 14
Measurement and Practical Math
Use arithmetic with length, area, volume, time, money and conversions.
UNIT 15
Advanced Practical Arithmetic
Apply arithmetic to finance, statistics, estimation and real-world decisions.
PRACTICE LAB
Practice until it makes sense.
New problems are generated automatically. Wrong answers can receive hints instead of immediately revealing the answer.
Press “New Problem” to begin.
Practice Exam
Generate a comprehensive 30-question Arithmetic practice exam covering the course.
LOCAL AI TUTOR
Ask “why?” as many times as you need.
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WHERE DID ARITHMETIC COME FROM?
Arithmetic has a story.
Mathematics did not suddenly appear in a textbook. People developed it over thousands of years because they had real problems they needed to solve.
Prehistoric counting
Long before written mathematics, people used marks, stones, fingers and other physical objects to keep track of quantities.
Mesopotamia
Ancient Mesopotamian civilizations developed sophisticated systems for calculation, trade, accounting, astronomy and measurement.
Ancient Egypt
Egyptian mathematics used arithmetic for construction, land measurement, taxation, food distribution and administration.
Indian mathematics
Indian mathematicians developed and refined the decimal place-value system and the use of zero that became fundamental to modern arithmetic.
Islamic Golden Age
Scholars across the Islamic world preserved, extended and transmitted mathematical methods, including the Hindu-Arabic numeral system.
Modern arithmetic
The Hindu-Arabic numerals 0 through 9 and positional decimal notation became the standard foundation for everyday calculation around the world.
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