← All courses
🧮

Abacus Foundations

From zero to mental maths mastery

13 levels·85 lessons·22h 6m total·Level 0 free
Start learning →

What you'll learn

  • ✓Read and represent numbers on a Japanese Soroban abacus
  • ✓Perform addition & subtraction using correct bead technique
  • ✓Master the Friends of 5 and Friends of 10 complement methods
  • ✓Carry and borrow across multi-digit numbers
  • ✓Visualise the abacus mentally, without touching the beads
  • ✓Build calculation speed and accuracy through daily practice

Course content

13 levels · 85 lessons
Lv 0

Level 0

Orientation & Foundations

7 lessons⌄
Lv 1

Level 1

Direct Addition

6 lessons🔒⌄
  • 🔒Day 8 · Adding 1–415 min
  • 🔒Day 9 · Adding 5–915 min
  • 🔒Day 10 · Multi-rod Addition15 min
  • 🔒Day 11 · Addition Speed Drill15 min
  • 🔒Day 12 · Level 1 Practice Day15 min
  • 🔒Day 13 · Level 1 Exam — Direct Addition20 min
Lv 2

Level 2

Direct Subtraction

6 lessons🔒⌄
  • 🔒Day 14 · Subtracting 1–415 min
  • 🔒Day 15 · Subtracting 5–915 min
  • 🔒Day 16 · Multi-rod Subtraction15 min
  • 🔒Day 17 · Mixed Add & Subtract15 min
  • 🔒Day 18 · Level 2 Practice Day15 min
  • 🔒Day 19 · Level 2 Exam — Direct Subtraction20 min
Lv 3

Level 3

Friends of 5

7 lessons🔒⌄
  • 🔒Day 20 · Why We Need Friends of 515 min
  • 🔒Day 21 · Adding with Friends of 515 min
  • 🔒Day 22 · Subtracting with Friends of 515 min
  • 🔒Day 23 · Mixed Operations — Add & Subtract15 min
  • 🔒Day 24 · Multi-rod Friends of 515 min
  • 🔒Day 25 · Level 3 Practice Day15 min
  • 🔒Day 26 · Level 3 Exam20 min
Lv 4

Level 4

Friends of 10

7 lessons🔒⌄
  • 🔒Day 27 · Why We Need Friends of 1015 min
  • 🔒Day 28 · Adding with Friends of 1015 min
  • 🔒Day 29 · Subtracting with Friends of 1015 min
  • 🔒Day 30 · Mixed Carry & Borrow15 min
  • 🔒Day 31 · Multi-digit Friends of 1015 min
  • 🔒Day 32 · Level 4 Practice Day15 min
  • 🔒Day 33 · Level 4 Exam20 min
Lv 5

Level 5

Mixed Complements

6 lessons🔒⌄
  • 🔒Day 34 · Why Mixed Complements?15 min
  • 🔒Day 35 · Mixed Complement Addition15 min
  • 🔒Day 36 · Mixed Complement Subtraction15 min
  • 🔒Day 37 · Multi-Rod Mixed Operations15 min
  • 🔒Day 38 · Mixed Complements Practice Day15 min
  • 🔒Day 39 · Level 5 Exam — Mixed Complements20 min
Lv 6

Level 6

Decimals

6 lessons🔒⌄
  • 🔒Day 40 · What Are Decimals?15 min
  • 🔒Day 41 · Adding Decimals15 min
  • 🔒Day 42 · Subtracting Decimals15 min
  • 🔒Day 43 · Mixed Decimal Operations15 min
  • 🔒Day 44 · Decimal Practice Day15 min
  • 🔒Day 45 · Level 6 Exam — Decimals20 min
Lv 7

Level 7

Multiplication

7 lessons🔒⌄
  • 🔒Day 46 · What is Multiplication?15 min
  • 🔒Day 47 · Single-digit Multiplication15 min
  • 🔒Day 48 · Multiplying by 6, 7, 8, 915 min
  • 🔒Day 49 · Two-digit × Two-digit15 min
  • 🔒Day 50 · Multiplication with Carries15 min
  • 🔒Day 51 · Multiplication Practice Day15 min
  • 🔒Day 52 · Level 7 Exam — Multiplication20 min
Lv 8

Level 8

Division

7 lessons🔒⌄
  • 🔒Day 53 · What is Division?15 min
  • 🔒Day 54 · Division by 2, 3, 4, 515 min
  • 🔒Day 55 · Division by 6, 7, 8, 915 min
  • 🔒Day 56 · Division with Remainders15 min
  • 🔒Day 57 · Two-digit ÷ Single-digit15 min
  • 🔒Day 58 · Division Practice Day15 min
  • 🔒Day 59 · Level 8 Exam — Division20 min
Lv 9

Level 9

Large Numbers & Speed

7 lessons🔒⌄
  • 🔒Day 60 · Large Numbers & Place Value15 min
  • 🔒Day 61 · Adding Large Numbers15 min
  • 🔒Day 62 · Subtracting Large Numbers15 min
  • 🔒Day 63 · Speed Addition Drills15 min
  • 🔒Day 64 · Speed Subtraction Drills15 min
  • 🔒Day 65 · Mixed Speed Challenge15 min
  • 🔒Day 66 · Level 9 Exam — Large Numbers & Speed20 min
Lv 10

Level 10

Anzan — Mental Calculation

8 lessons🔒⌄
  • 🔒Day 67 · What is Anzan?15 min
  • 🔒Day 68 · Single-digit Anzan15 min
  • 🔒Day 69 · Two-digit Anzan15 min
  • 🔒Day 70 · Flash Anzan15 min
  • 🔒Day 71 · Speed Anzan Challenge15 min
  • 🔒Day 72 · Anzan with Large Numbers15 min
  • 🔒Day 73 · Anzan Practice Day15 min
  • 🔒Day 74 · Level 10 Grand Master Exam — Anzan20 min
Lv 11

Level 11

Square Roots

6 lessons🔒⌄
  • 🔒Day 75 · What is a Square Root?15 min
  • 🔒Day 76 · Two-digit Square Roots15 min
  • 🔒Day 77 · Three-digit Square Roots15 min
  • 🔒Day 78 · Square Roots with Remainders15 min
  • 🔒Day 79 · Square Roots Practice Day15 min
  • 🔒Day 80 · Level 11 Exam — Square Roots20 min
Lv 12

Level 12

Cube Roots

5 lessons🔒⌄
  • 🔒Day 81 · What is a Cube Root?15 min
  • 🔒Day 82 · Two-digit Cube Roots15 min
  • 🔒Day 83 · The Full Cube Root Algorithm15 min
  • 🔒Day 84 · Cube Roots Practice Day15 min
  • 🔒Day 85 · Level 12 Exam — Cube Roots20 min

Requirements

  • •No prior abacus knowledge required
  • •A 13-rod Japanese Soroban abacus is recommended (not required for Level 0)
  • •About 10–15 minutes a day

Description

A structured 13-level journey through the Japanese Soroban abacus. Build lightning-fast mental arithmetic skills from scratch.