10 Math Tricks That Feel Illegal 🤯 (No Calculator)

10 mental math tricks that feel like cheating. 🤯 No calculator, no paper — and after each one you get a second problem to try it on yourself. Most "math trick" videos show you a shortcut and move on. These make you USE it, so it actually sticks. ▶ How to watch: pause on each problem, have a go, then see the trick. Then the "NOW YOU TRY" card is your turn. ⏱ THE 10 TRICKS 00:00 Start 00:04 #1 — Times 11, split the digits (63 × 11) 00:29 #2 — Squares ending in 5 (35²) 00:55 #3 — Halve one, double the other (18 × 45) 01:21 #4 — Divide by 5? Double it (340 ÷ 5) 01:47 #5 — The 15% tip in two seconds (15% of 60) 02:12 #6 — Subtract from 1000 instantly (1000 − 468) 02:38 #7 — Sneak up on a square (13 × 17) 03:04 #8 — Pair from both ends (1 + 2 + … + 100) 03:30 #9 — Odd numbers make squares (1 + 3 + … + 99) 03:55 #10 — The percentage that cancels (+25% then −20%) 04:21 Which one blew your mind? 👇 Which one did you already know? And which one blew your mind? 🔔 Subscribe — a new brain workout every day. Great for: mental math practice, test prep, homeschool warm-ups, and anyone who wants to stop reaching for their phone to work out a tip. #math #mathtricks #mentalmath #brainteaser #mathquiz #maths — Original content made for educational and entertainment purposes.