Number Gym

by ioncreature

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School math, step by step

Most Number Gym courses teach school math the way a good tutor would — short lessons that build on each other, hands-on practice, and a final exam. Pass it and you earn a shareable certificate. Free to start, no ads.

School math courses

Multiplication Table

Free

A course with theory and practice — from basics to the full table

17 lessons

Lessons

  1. What is multiplication
  2. Order does not matter
  3. Tables ×1 and ×10
  4. Table ×2
  5. Table ×4
  6. Review: ×2, ×4
  7. Table ×5
  8. Table ×9
  9. Review: ×5, ×9
  10. Table ×3
  11. Table ×6
  12. Review: ×3, ×6
  13. Table ×8
  14. Table ×7
  15. Review: ×7, ×8
  16. Division as inverse
  17. Speed mix

Big Multiplication Table

Premium

Multiply 11–19 by splitting into ×10 and the rest

15 lessons

Lessons

  1. From ×10 to ×12Free
  2. Table ×11Free
  3. Table ×12Free
  4. Review: ×11, ×12
  5. Table ×13
  6. Table ×14
  7. Table ×15
  8. Review: ×13–×15
  9. Table ×16
  10. Table ×17
  11. Review: ×16, ×17
  12. Table ×18
  13. Table ×19
  14. Review: ×18, ×19
  15. Squares 11–19

Addition & Subtraction

Premium

A course with theory and practice — adding and subtracting up to 100

14 lessons

Lessons

  1. What is addingFree
  2. Add to 10Free
  3. Subtract to 10Free
  4. Review: to 10
  5. Crossing 10
  6. Crossing 10 back
  7. Review: crossing 10
  8. Add to 50
  9. Subtract to 50
  10. Review: to 50
  11. Mix to 100
  12. Find the missing
  13. Review all
  14. Speed mix

Division

Premium

A course with theory and practice — division from 2 to 9

13 lessons

Lessons

  1. What is divisionFree
  2. Divide by 2Free
  3. Divide by 3Free
  4. Divide by 4
  5. Divide by 5
  6. Review: ÷2–÷5
  7. Divide by 6
  8. Divide by 7
  9. Divide by 8
  10. Divide by 9
  11. Review: ÷6–÷9
  12. Find the dividend
  13. With remainder

Fractions

Premium

A course with theory and practice — fractions from slices to operations

12 lessons

Lessons

  1. What is a fractionFree
  2. Equal fractionsFree
  3. Bigger fractionFree
  4. Add (same bottom)
  5. Subtract (same bottom)
  6. Review: same bottom
  7. Common bottom
  8. Add (different bottoms)
  9. Fraction × number
  10. Fraction of a number
  11. Find the top
  12. Speed mix

Percentages

Premium

A course with theory and practice — percent tricks, discounts, and markups

12 lessons

Lessons

  1. What is percentFree
  2. Half is 50%Free
  3. Ten percentFree
  4. Quarter is 25%
  5. Review: simple
  6. More percents
  7. Find the %
  8. Find the number
  9. Discount
  10. Markup
  11. Percent of percent
  12. Speed mix

Powers & Roots

Premium

Squares, cubes, roots, and powers — through tricks and recognition

10 lessons

Lessons

  1. Squares 1–10Free
  2. Squares 11–15Free
  3. Cubes 1–5Free
  4. Cubes 6–10
  5. Review: squares, cubes
  6. Square roots
  7. Cube roots
  8. Powers of 2
  9. Powers of 10
  10. Power forms

Column Addition & Subtraction

Premium

Add and subtract in column format

12 lessons

Lessons

  1. Add 2-digitFree
  2. Add with CarryFree
  3. Subtract 2-digitFree
  4. Subtract with Borrow
  5. Review: 2-digit
  6. Add 3-digit
  7. Subtract 3-digit
  8. Review: 3-digit
  9. Add 4-digit
  10. Subtract 4-digit
  11. Missing Digits
  12. Mixed

Column Multiplication

Premium

Multiply in column format

10 lessons

Lessons

  1. 2-digit × 1-digitFree
  2. With CarryFree
  3. 3-digit × 1-digitFree
  4. Review: × 1-digit
  5. Intermediate Rows
  6. 2-digit × 2-digit
  7. 3-digit × 2-digit
  8. Missing Digits
  9. Large Numbers
  10. Mixed

Long Division

Premium

Divide step by step on paper

11 lessons

Lessons

  1. Division Warm-UpFree
  2. RemaindersFree
  3. First StepsFree
  4. 3-digit Numbers
  5. Quotient Only
  6. Zeros in the Answer
  7. Division with Remainder
  8. 2-digit Divisors
  9. Large Numbers
  10. Missing Digits
  11. Mixed Practice

Beyond school math

Logic Gates

Free

From Boolean formulas to circuits and CPU registers

24 lessons

Lessons

  1. What are gates
  2. A little history
  3. AND
  4. OR
  5. AND and OR mixed
  6. NOT
  7. XOR
  8. Four operations recap
  9. Operator precedence
  10. Parentheses
  11. Symbols ↔ words
  12. Boolean laws
  13. Formulas as circuits
  14. Simple circuits
  15. Multi-gate circuits
  16. Complex circuits
  17. From bits to registers
  18. AND gate (registers)
  19. OR gate (registers)
  20. XOR gate (registers)
  21. AND, OR, XOR mixed
  22. NOT on registers
  23. Two-step circuits
  24. Before the exam