Mental maths · lesson 2 of 28 · free

Add by bridging through 10 — Mental Maths Mastery

When the ones add up to more than 10, jump to the next ten first. Split the number you are adding into “what fills the ten” and “the rest”.

▶ Watch how it works

Got it? Practise ↓

How to do it in your head

Bridge through 10 — “fill up to the next ten, then add the rest”

  1. How much does the first number need to reach the next ten?
  2. Split the second number into that much and the rest.
  3. Jump to the ten, then add the rest.

Use it for: Adding a 1-digit number to any number, adding up scores, and counting on.

Worked example: 47 + 8 = 55

  1. 47 needs 3 to make 50. Split 8 into 3 and 5.
  2. 47 + 3 = 50.
  3. 50 + 5 = 55.

Check: 47 + 8 = 40 + 15 = 55 ✓

▶ 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 2 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 🌉 Bridge Master 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.

🖨️ Bridging Through 10 Mental Addition Worksheet

✨ Free AI tutor

Ask the AI tutor about this lesson

Why does it work? When should you use it? Ask in English, मराठी or हिंदी.

Sign in with Google to ask Free — 20 questions a day.

👩‍🏫 Mental maths classes — live online, request a call back

Prefer a real teacher? TalentJR teachers take live online classes anywhere in India. Tell us what you need and our team will call you with timings and fees.

Live online classesSmall groups or 1:1 with a teacher, from home, any city.
We call you backOur team asks what your child needs, then shares timings and fees.
Home tutor?We are still building our list of home tutors — ask on the call if there is one near you.
Badges, certificates & gifts A badge for every lesson you pass, a certificate for every part you finish, plus TalentJR Points for daily practice. Tables & multiplication Still learning tables? Start with Tables & Multiplication Mastery.