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Numerical
Hard
MM
Mental Arithmetic
Fast maths, no calculator
Each equation has a missing value shown as a box (□) — choose the digit that makes it true. It adapts as you go: easy items are addition, harder ones add multiplication and larger numbers, and the hardest have two boxes. Five speeded minutes, no calculator — the rapid mental computation NATS lists under numerical ability.
Duration
~5 min
Length
Speeded set
Difficulty
Hard
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What to expect
- Equations with a missing value shown as a box.
- Difficulty that rises and falls with your accuracy.
- A running clock — as many as you can in five minutes.
What it measures
- Mental calculation at speed
- Number sense and estimation
- Accuracy under a countdown
Instructions
- 1Tap the digit (1–9) that fills the box to make the equation true, then Submit.
- 2Tap a filled box to clear it; the hardest items have two boxes to fill.
- 3Estimate first to catch slips, and bank the easy ones fast.
Tips
- Round to sanity-check every answer.
- Drill times tables and simple fractions until they're cold.
Sample question
Mental Arithmetic
One value is missing. Choose the digit that makes the equation true — no calculator, and the real test speeds up as you get them right.
7 × □ + 4 = 39
Format: Fill-the-box equations · adaptive · 5 min