Blog Post #99: Hoi Yuet’s Happy High Five!

Dear Readers,

Currently, my youngest Musica Mundi School Maths students are a super ‘High Five’ of Barbara, Jan, Julija, Sophie and—last, but certainly not least!—Hoi Yuet who turns from 11 to 12 tomorrow! They’ve all been happily and successfully going round in circles recently!!

Happily going round in circles!

Yes, the young stars have been solving numerous problems involving Circle Theorems, and have therefore encountered the number 360 more than a few times! They should all be awarded Degrees in Circles Maths!

Friends with no end!

To celebrate Hoi Yuet marching on and up from 11, feel free to grab a calculator and work out the high-five product 11 x 12 x 13 x 14 x 15.

A ‘High Five’ for Hoi Yuet and her classmates!

The result of 360360 will hopefully bring a nice, round smiley to some faces!

Young Music Stars & Talented Maths Students

Now it’s time for an early ‘Happy 12th Birthday Maths True Story Puzzle’ for Hoi Yuet and everyone to enjoy!

A Maths teacher went into a shop to buy some nice prizes. He started with 15 euros in his pocket–not an everyday story! After buying the prizes, he had no notes left in his pocket, but he did have one each of the following coins:

In honour of Hoi Yuet, how much money did the Maths teacher spend on buying nice prizes?
Congratulations for calculating that the Maths teacher had 3.88 euros left,
and he spent 11.12 euros in honour of Hoi Yuet turning from 11 to 12 !

Here in Blog Post #99, use the numbers 11, 11, 11 and 11 in a calculation that gives a result of 99.

High Target 99

Specially for Hoi Yuet, use the numbers 11, 11 and 11 in a calculation that gives a result of 12.

Here’s wishing Hoi Yuet a super-happy birthday, turning 12 tomorrow!

Wishing everyone a wonderful weekend now,

Paul Motwani xxx

P.S.=Puzzle Solutions!

Possible solutions include 11 x 11 – 11 -11 = 99 & 11 + 11/11 = 12.

Extra Birthday Bonus Fun & Magic Maths for Hoi Yuet’s Happy High Five!

  1. Start with 11 in honour of Hoi Yuet’s last day now as an 11-year-old.
  2. In recognition of the five friends & classmates Barbara, Jan, Julija, Sophie & Hoi Yuet, multiply by 2 x 2 x 2 x 2 x 2.
  3. We should now have 352. Subtract my favourite 3 to get 349.
  4. It’s time to bring in a ‘Happy Hundred’. Calculate (352 x 352 – 349 x 349)/100.
Calculate (352 x 352 – 349 x 349)/100 to get a lovely result for Hoi Yuet’s birthday tomorrow.

5. The result of 21.03 is to celebrate Hoi Yuet’s 21 March birthday!

Author: Paul A. Motwani

My name is Paul Motwani, but my colleagues, my students and their parents mostly call me "Mr. Mo"! My middle initial, A, stands for Anthony, because I was born on the official feast day of St. Anthony of Padua, the patron saint of miracles and of lost souls. I love teaching Mathematics and Chess, and giving fun-packed talks and shows in schools and clubs. The popular ingredients of Math, Chess, Mystery and Magic are my "Fantastic Four", and I give prizes too! I am an International Chess Grandmaster, and (loooooong ago!) I was the World Under-17 Champion. I am the author of five published chess books and hundreds of newspaper articles. I live with my wonderful wife and son in Belgium. I also love music, movies and puzzles. I blog at My e-mail address is You can find me on Facebook, too.

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