Beyond 9×9.
Ultra Brain is a math training app for elementary school students. It takes calculation from “memorizing” to working it out yourself, quickly and accurately.
Four subjects, plus a “Flip side” with decimals, fractions, and negative numbers. Daily practice trains, little by little, skills beyond what school covers.
[ Four subjects, three courses ]
Every subject has Beginner (free), Intermediate, and Master courses.
• Addition: Beginner has no regrouping, Intermediate has regrouping, Master is two-digit + two-digit.
• Subtraction: the reverse of Addition. Master subtracts a two-digit number. No negative answers.
• Multiplication: Beginner is up to 9×9, Intermediate up to 19×19, Master up to 99×99.
• Division: with remainders. Divisor and answer are 1–9 in Beginner, 1–19 in Intermediate, 1–99 in Master.
[ Step by step, at a comfortable pace ]
2 choices → 3 choices → 4 choices → Type the answer, one step at a time.
Other types of practice, such as Missing number, Work backward, Compare, Same answer, Find the family, Make the number, Fact family, and Similar problems, come at the same calculation from different angles, in all four subjects.
[ Review practice with the opposite operation ]
Check what you're practicing with the opposite otraction in Addition, Review with addition inSubtraction, Review with division in Multiplication, Review with multiplication in Division.
[ Flip side: decimals, fractions, and negative numbers ]
Below the subject selection, the “Flip side” has decimals, fractions, and negative numbers.
• Flip side A (decimals), Flip side B (fractions), Flip side C (negative numbers): Beginner, Intermediate, and Master for
each operation.
• Flip side shuffle: Flip side A, B, and C problems, changing with each problem.
• Flip side Hyper: two of the three kinds of num
Instead of a rank test, there is a “100-problem challenge” with a time limit. Get all 100 correct to clear it.
The Flip side is available after purchase, from
[ Strategy guide, Hint, and How to think about ir) ]
13 × 17, 97 × 96, 47 × 36… Even big calculations have shortcuts. So do addition, subtraction, division, and the Flip side.
• “Hint” (during practice): the way to solve thambers. The last step is yours.
• “How to think about it” (after a miss): how to solve that problem.
• “Strategy guide”: read 53 ways to solve. Mark star.
[ Find tricky problems and get past them ]
Problems you missed or took a long time on are collected automatically as “Tricky problems” for focused practice, in each
subject and the Flip side.
[ Rank test and 10-problem challenge ]
• Rank test: no hints, one answer per problem. Results are Rank S, A, or B.
• 10-problem challenge: times 10 problems, to cobest.
[ Look back at each answer ]
After a 10-problem challenge, rank test, or 100-problem challenge, “Answer review” shows each problem in order, with your
answer, whether it was correct, and the seconds
[ Easy to use ]
• Stop partway and pick up again with “Continue.”
• Set the number of practice problems with the smber.
• “Multiplication chart”: check the times tables anytime.
• In Japanese and English.
[ About the purchase ]
• The app and the Beginner course in all four subjects are free.
• A one-time purchase opens all of the following
Intermediate and Master in all four subjects / all of the Flip side (from Beginner) / strategy guide / all times tables
in the multiplication chart
• Once you purchase, practice added in the future is also available with no additional payment.
[ An app you can hand over without worry ]
• No ads.
• No account sign-up.
• No information about you is collected. Practicon this device and never sent out.
• All practice works offline.
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