Stage 1 of 20

Single-Digit Addition

Build your foundation by fluently adding any two single-digit numbers whose sum is 9 or less. This stage develops instant recall — the bedrock of all mental math.

What You'll Learn

  • Recall addition facts up to 9 + 9 without hesitation
  • Recognize number pairs that combine to make small sums
  • Develop a steady rhythm for rapid-fire practice

Explanation

Mental math begins with facts you know by heart. When you see 4 + 3, the answer 7 should appear instantly — not after counting on your fingers.

Start by grouping facts into families. All combinations that make 5 (1+4, 2+3) share the same structure. Learning one helps you learn the others.

Say each fact aloud as you practice: "five plus two equals seven." Hearing the words reinforces the visual pattern in your memory.

Aim for accuracy first, then speed. Missing a fact slows you down more than answering slowly but correctly.

Pro Tips

  • Use a timer only after you can answer 20 facts correctly in a row.
  • If you hesitate on a fact, repeat it five times before moving on.
  • Practice in short bursts — 5 minutes daily beats one long session.

Practice Exercises

Work through each problem mentally. Click "Show Answer" when you're ready to check.

  1. 1. 3 + 4 = ?
  2. 2. 5 + 2 = ?
  3. 3. 1 + 8 = ?
  4. 4. 6 + 3 = ?
  5. 5. 2 + 5 = ?
  6. 6. 4 + 4 = ?
  7. 7. 7 + 1 = ?
  8. 8. 3 + 3 = ?
  9. 9. 5 + 4 = ?
  10. 10. 2 + 6 = ?