TalentJR apps
Doubling and halving are the secret behind many maths tricks. The quick way: split the number into tens and ones, double (or halve) each part, then put them back together.
✓ You passed this trick’s test.
Split and double — “double the tens, double the ones, add”
Use it for: Sharing sweets fairly, doubling a recipe, and the × 4 and × 5 tricks.
Check: 37 + 37 = 74, and half of 74 is 37 ✓
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 🎈 Doubles Dazzler badge when you pass — and a certificate when you finish all 5 tricks of Part 1 · Finger & table tricks. 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.