TalentJR apps
Split the number into tens and ones. The square is the tens squared, plus two times tens × ones, plus the ones squared — three easy pieces you add in your head.
✓ You passed this lesson’s test.
(a + b)² — “a² + 2 × a × b + b²”
Use it for: Area of a square, Class 6–8 squares and square roots, and checking (a + b)² in algebra.
Check: 27 × 27 = 27 × 30 − 27 × 3 = 810 − 81 = 729 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
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 💎 Square Star badge when you pass — and a certificate when you finish all 6 lessons of Part 3 · Mental maths for daily life. You can still take the test without signing in.
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.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.