Kani Math
Cosmic Abacus
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Math facts practice

Fact fluency is automaticity — answering 7 + 6 without counting. This drill serves the facts one at a time and tells you instantly whether the recall is there yet.

  • 2 rows × 1 digits, add & subtract
  • About 5 min
  • Free, no account

Sample problems

Real problems from this drill, with answers. Nothing to install, no account, no email — work them on paper, on a physical abacus, or in your head.

  1. 1
    2
    + 9
    ?
  2. 2
    6
    + 8
    ?
  3. 3
    1
    + 8
    ?
  4. 4
    3
    + 1
    ?
  5. 5
    6
    + 2
    ?
  6. 6
    7
    + 8
    ?
  7. 7
    9
    + 1
    ?
  8. 8
    2
    + 3
    ?
  9. 9
    7
    − 3
    ?
  10. 10
    8
    + 1
    ?
  11. 11
    8
    + 3
    ?
  12. 12
    9
    + 3
    ?
Full answer key
  1. 2 + 9 = 11
  2. 6 + 8 = 14
  3. 1 + 8 = 9
  4. 3 + 1 = 4
  5. 6 + 2 = 8
  6. 7 + 8 = 15
  7. 9 + 1 = 10
  8. 2 + 3 = 5
  9. 7 − 3 = 4
  10. 8 + 1 = 9
  11. 8 + 3 = 11
  12. 9 + 3 = 12

This page is one drill. The app is the whole programme.

Kani Math is a full mental-arithmetic course, not a single exercise. Free to start, no signup, and it runs on the web, Android and iPhone.

  • ✓Nine levels, from the first bead to division
  • ✓Guided lessons that teach the technique, not just drills
  • ✓Flash, listening and abacus drills at a speed you set
  • ✓Versus matches against friends or the computer
  • ✓Say your answers out loud — the app listens and marks them
  • ✓Streaks, coins and badges, with parent and teacher views

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Practise it now

The same drill, live in your browser, with a virtual soroban and instant marking.

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Loads a full interactive drill right here on the page. It never asks who you are.

No signup. Nothing saved unless you ask.

Explore the free virtual abacus →How to use an abacus →Mental Math Drill →

About this drill

Teachers call it fact fluency: single-digit sums and differences produced from memory, not worked out. It is the floor every later skill stands on — multi-digit arithmetic, fractions, mental math — and the reason a child who still counts on fingers at nine finds everything slow.

This page drills exactly that floor: single-digit addition and subtraction facts, checked the moment you answer. The abacus method builds the same automaticity another way — the bead picture replaces counting, so the fact is read rather than computed, which is why abacus students tend to clear fact-fluency screens early.

How to practise it

  1. 1Start the drill — one fact appears at a time.
  2. 2Answer from memory; try not to count up or down.
  3. 3Watch the instant check, then take the next fact.
  4. 4Repeat the set daily — fluency is about frequency, not session length.

Questions

What are math facts?
The single-digit addition, subtraction, multiplication and division combinations — 7 + 6, 13 − 5, 8 × 4 — that fluent students recall instantly instead of computing. This drill covers the addition and subtraction families.
How often should a child practice math facts?
Short and daily beats long and weekly: five minutes a day moves automaticity faster than half an hour on Saturday. The drill is deliberately short enough to fit that rhythm.
How does the abacus build fact fluency?
Beads give each quantity one visual shape, and the complement pairs (5s and 10s) replace counting with a single move. After enough repetitions the child sees 7 + 6 as a bead picture and reads off 13 — automaticity by another route.
Is this the same as the timed tests at school?
Same facts, friendlier format — no printed sheet, no red pen. Instant feedback per fact also teaches more than a score at the end of a page.
Learn the techniqueSmall friends (5-complements)Walk through it on the beads →