Add 2-digit numbers left to right — Mental Maths Mastery

How to do it in your head

Tens first — “add the tens, then the ones, from left to right”

1. Keep the first number as it is.
2. Add the tens of the second number.
3. Add the ones.

Use it for: Adding prices, marks and scores without writing them down.

Worked example: 58 + 34 = 92

✏️ 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 6 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 🚂 Tens-First Express badge when you pass — and a certificate when you finish all 7 lessons of Part 1 · Mental addition & subtraction. You can still take the test without signing in.

🖨️ Mental Addition Worksheet for Class 2 and 3

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