How to solve the book trick.
You have all witnessed the maths book trick – now you can wow other people with it.
Take any book – find page 108, line 9 and write the first word down.
Choose any 3 numbers
eg 3 7 and 9. Put them in any order to make a 3 digit number – 397. Switch this number round (793) and subtract the smaller number from the larger number.
So 793 – 397 = 396
Take your answer and switch this round , this gives you 693.
Add together the last 2 numbers you have made – 396 + 693 = 1089
When you do this to any 3 digits, the answer will always be 1089. As long as the difference between the first and last digit on the 3 digit number is greater than 1.
Take any book, find page 108, line 9 and read out the first word.
Leave a comment when you have tried it – let me know how you get on.