Soroban questions, answered

Questions parents and teachers ask most, each answered in the first three lines, with the reasons below.

• What age should a child start soroban?
  Five to six is the usual starting age, but the real test is whether the child can read and write 1–10 and sit for ten minutes. Starting at 8 or 9 is not too late. Age-by-age guide, what the research says, and what to do if your child is not ready yet.
• Anzan (mental abacus) explained: how children calculate without the beads
  Anzan means picturing a soroban in the mind and moving its beads. Numbers are handled as shapes, not words, which is why experts add ten 3-digit numbers in their head. The three stages, what brain imaging shows, why the image breaks, and how to practise it at home.
• Soroban benefits: what the research actually says
  Yes, soroban works, but mainly for arithmetic speed, accuracy and number memory, not general intelligence. A 3-year randomised trial of 183 children, brain-imaging studies of experts and memory experiments, with sources. Also what the evidence does not support.
• What makes good soroban learning? 7 conditions to check in any class, program or app
  Good soroban learning, in a school, a franchise like UCMAS, at home or on an app, meets seven conditions: small level steps, visible mistakes, 10–15 minutes daily, levels that lead to a real exam, low teacher workload, home and class connected, and a record of progress. Why each matters, and the questions to ask before you sign up.
• How long does soroban take? From the first kyu levels to dan
  Japanese soroban grades count down from 10th kyu to 1st kyu, then up from 1st dan to 10th dan. With a weekly lesson plus ten minutes a day, a child who starts at 6 typically reaches 1st kyu in 4–6 years and 1st dan a year or two later. A year-by-year table and what slows children down.
• My child stopped abacus classes. How do we keep the mental math?
  Mental abacus skill fades without use, but 5–10 minutes on 3–5 days a week keeps it. How to test the current level in five minutes, what to do after a program ends, after tablet-based lessons or during a busy school year, and how to bring back skill that has slipped.
• How to learn soroban at home without a teacher
  You need a 23-rod soroban ($15–30), one method for the fingers, a level ladder with small steps, and ten minutes a day. The order to learn things in, the two rules that replace a teacher, and where home learners go wrong.
• Soroban vs UCMAS vs Kumon vs mental-math apps: which is right for your child?
  UCMAS and ALOHA are franchise abacus programs with their own 8–10-level ladders; Kumon is worksheet arithmetic without an abacus; apps range from free with ads to a few dollars a month. A frank comparison of method, cost, who checks mistakes, and which one leads to a recognised exam.
• For teachers: 7 things to check before paying for abacus class software
  Many tools for abacus classes replace the real abacus with beads on a screen and report a score. Before you pay, check whether it keeps the physical abacus, shows the likely wrong bead move, lets you define your own levels, returns homework marked the same day, and what it costs at your class size.
• For teachers: a flash anzan progression that climbs without stalling
  Flash anzan (numbers flashed briefly, added in the head) stalls when teachers raise digits, terms and speed at the same time. Raise one at a time, in a fixed order, in small steps. A progression table from 1-digit 3 terms at 3 seconds to 3-digit 10 terms under 2 seconds, the two-minute class routine, and how to tell which of the three is the problem.
• For teachers: soroban grading systems compared (Japanese kyu/dan vs UCMAS-style levels)
  Japanese kyu/dan grades come from exam bodies (Nissho 1st–6th kyu, Zenshuren 15th kyu to 10th dan, and others); UCMAS, ALOHA and most apps use their own ladders. Names do not map one to one. Compare by digits and terms, and give families one table so home and school levels agree.
• For teachers: moving abacus homework from the workbook to a screen, without losing the real abacus
  You can move homework off paper and keep the physical abacus. The child solves on their own abacus and types the answer; the screen marks it, keeps the mistake type for the teacher, and generates tomorrow's set. What changes, what stays, and a 2-week switch plan.
• For teachers: soroban homework that actually gets done at home
  Homework sticks when it is short, at the same time every day, and its results come back to the teacher. Ten minutes, five days a week, five problems per subject. Paper vs app, what to tell parents (with a template), and what to do with families who never do it.
• Free soroban mistake observation sheet for teachers (printable)
  A free, printable one-page sheet for abacus teachers. A wrong answer is a clue, not a diagnosis: six things to observe (5-complements, 10-complements, carrying, place value, reading the answer, clearing), what each looks like, and a 20-student record table. A4 and US Letter.
• For teachers: how to read a child's soroban mistakes
  Treat a wrong answer as a wrong bead movement, not a calculation error. Four types cover almost everything: 5-complement, 10-complement (carry/borrow), column shift, and reading/copying. A table for telling them apart, the "three times" rule, and how to record them.
• For teachers: between lessons, how to see what your abacus students do at home
  Lessons are one or two hours a week; the other six days decide whether a child progresses. What a teacher can know about home practice with paper (almost nothing), with a parent message (a little), and with a tool that records each attempt (which days, which mistakes). A three-line weekly parent routine that does not ask parents to teach.
• For teachers: tracking 20 students' mistake types without a spreadsheet
  Five or six patterns account for most abacus errors in a class. Track the pattern, not the score, and you know what to fix first instead of seeing the same error for months. Here is the six-pattern list, a one-line-per-student card that works on paper, and what a tool should do if you want it automated.
• What is a soroban? (and how it differs from the Chinese abacus)
  The soroban is the Japanese abacus, one 5-bead and four 1-beads per rod, usually 23 rods. It differs from the Chinese suanpan (two 5-beads, five 1-beads) and is the tool behind "mental abacus" calculation. History, parts, what children learn on it, and why the bead layout matters.