Choose your 2×2 method: split, round or factor — Mental Maths Mastery
There are three good ways to multiply two 2-digit numbers in your head. Look at the numbers first and choose the one that makes the steps smallest — that choice is the real skill.
✓ You passed this lesson’s test.
How to do it in your head
Pick the easy road — “split, round and take away, or break into factors”
Split: if one number has small ones (like 23), do × 20 and × 3 and add.
Round and take away: if a number ends in 8 or 9 (like 39), do × 40 and take away × 1.
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.
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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🏁 Lesson 24 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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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
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