TalentJR apps
Whatever divides two numbers also divides their difference. So you can shrink the numbers by subtracting until the HCF is left — no factor trees.
✓ You passed this trick’s test.
Sankalana-Vyavakalanabhyam — “by addition and by subtraction”
Use it for: HCF of two numbers (Class 5–8), simplifying fractions (trick 33).
Check: 84 = 2 × 42 and 126 = 3 × 42, and 2 and 3 share no factor ✓
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 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🤝 HCF Hero badge when you pass — and a certificate when you finish all 6 tricks of Part 4 · Algebra & number sense. 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.