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Mental maths · lesson 8 of 28 · free

Multiply 2-digit by 1-digit, tens first — Mental Maths Mastery

Start with the tens: it gives the big part of the answer straight away. Then multiply the ones and add — the same left-to-right idea as adding.

▶ Watch how it works

Got it? Practise ↓

How to do it in your head

Tens first — “multiply the tens, keep it, then add the ones”

  1. Split the 2-digit number into tens and ones.
  2. Multiply the tens and keep that answer in your head.
  3. Multiply the ones and add.

Use it for: Shopping totals (7 pens at ₹68), quick checks, and every bigger multiplication.

Worked example: 68 × 7 = 476

  1. Split 68 into 60 and 8.
  2. 60 × 7 = 420 and 8 × 7 = 56.
  3. 420 + 56 = 476.

Check: 68 × 7 = 70 × 7 − 2 × 7 = 490 − 14 = 476 ✓

▶ Watch it animated

✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ 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”.

Right: 0 · Tried: 0

🏁 Lesson 8 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 Rocket badge when you pass — and a certificate when you finish all 6 lessons of Part 2 · Mental multiplication & division. You can still take the test without signing in.

🖨️ Mental Multiplication Worksheet for Class 3 and 4

✨ Free AI tutor

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