Choose your 2×2 method: split, round or factor — Mental Maths Mastery

How to do it in your head

Pick the easy road — “split, round and take away, or break into factors”

1. Split: if one number has small ones (like 23), do × 20 and × 3 and add.
2. Round and take away: if a number ends in 8 or 9 (like 39), do × 40 and take away × 1.
3. Factor: if a number is in a times table (like 24 = 8 × 3), multiply by one factor, then the other.

Use it for: Prices of 2-digit quantities, area of rooms, and Olympiad speed rounds.

Worked example: 39 × 26 = 1014

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

🏁 Lesson 24 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🧰 Method Picker badge when you pass — and a certificate when you finish all 9 lessons of Part 4 · Bigger numbers, fractions and the calendar. You can still take the test without signing in.

🖨️ 2-Digit by 2-Digit Mental Multiplication Worksheet

• Worksheet set 1 (PDF)
• Worksheet set 2 (PDF)
• Worksheet set 3 (PDF)