Brainaboo Abacus
A virtual soroban kids move with their fingers, with the same levels as the books.
Activity books for ages 4–10
Learning that feels like play!
Abacus, telling time, logic, puzzles and drawing books where Boo the owl, Mia and Rohan turn every new skill into a story. Every puzzle is original, checked by our software, and answered at the back.
13kinds of book
6abacus levels
1,028sums in Abacus Level 3
Shop by age
Pick your child's age
Every book comes in 4–6, 6–8 and 8–10 editions, so the puzzles grow with your child. Abacus books go by level, because kids learn the abacus in stages.
The bookshelf
Every Brainaboo book
Big 8.5 × 11 inch paperbacks on Amazon.com, with new titles every week. Hover over a book to open it a little.
Try it yourself
Tap the beads!
This is a soroban, the Japanese abacus our books teach. The gold bead is worth 5 and each purple bead is worth 1. Push beads to the bar and watch the number change.
0
Tap a purple bead to make 1!
1
Meet the Abacus
2 + 2Reading beads and direct sumsAges 4–72
Small Friends
+4 = +5 − 1The 5-bead helps when 1-beads run outAges 5–83
Big Friends
+7 = +10 − 3Adding and taking away across 10Ages 6–94
Mix Friends
+6 = +10 − 5 + 1Big and small friends togetherAges 6–105
Big Numbers
352 + 417List sums and mental mathAges 7–106
× and ÷
34 × 6Multiplication and divisionAges 8–11Telling time
What time is it right now?
It's 3:00, three o'clock.
Hour handMinute handSeconds
This clock shows your time. Our Telling Time books start with o'clock and half past for ages 4–6, then quarter past and a.m./p.m. for 6–8, then elapsed time, 24-hour clocks and bus timetables for 8–10.
Inside every book
Made for kids, trusted by parents
✓
Every answer checked
Our software solves every puzzle a second way before it goes in the book. No impossible sudokus, no wrong answers.
↗
Easy, Medium, Hard
Pages are labelled and get harder step by step, so kids feel success first.
∞
Never repeated
Puzzles are original and never repeat between volumes. Every new book is new practice.
☺
Comic stories
Boo, Mia and Rohan teach each big idea in a comic before the practice starts.
A
Full answer key
All the answers are at the back, ready for a quick check by a grown-up.
★
A certificate
Every book ends with a certificate to fill in and celebrate.
Meet the friends
Boo, Mia and Rohan
They're in every book: in the comics, on the covers, and cheering kids on through the hard pages.
Boo
The Wise Little OwlKnows every bead rule and clock trick, and explains them slowly, with a wink.
Mia
The Curious LearnerAsks the questions every child is thinking, then works them out on her abacus.
Rohan
The Energetic ExplorerAlways in a hurry, often late, and always ready for the next puzzle.
Football at quarter past 4! When is that?
?
Quarter past means 15 minutes after. That's 4:15!
4:15
I'll never be late again!
★
Coming soon
More from Brainaboo
Brainaboo Sudoku
Sudoku for kids, with rooms to play with friends.
Famous People comics
Boo, Mia and Rohan meet A.P.J. Abdul Kalam, Albert Einstein and other great thinkers.
Brainaboo Olympiad
A reasoning and abacus olympiad for schools, built on the books.
Books in India
Brainaboo books for Indian families, with Indian heroes and rupee prices.