by David, 19 September 2018 | 0 comments

On Sunday, 1 January, Latda announced her New Year’s resolution. “Throughout this year, on the fifth Sunday of the month, I’ll throw a party!” How many fifth Sunday parties did Latda celebrate that year?

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by David, 5 September 2018 | 0 comments

Peter’s just finished building a new staircase up to the attic. It just fits along the four-metre-long wall of his lounge room, and it’s three metres tall. It has exactly 15 steps. Peter wants to have a carpet running along the staircase. How long does it need to be?

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by David, 21 August 2018 | 0 comments

Can you work out the next letter in this sequence? H, T, Q, F, S, S, E, N, … Hint: There are numbers lurking behind those letters. And as it grows, this sequence is shrinking!

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by David, 8 August 2018 | 3 comments

Imagine your calculator is broken. Although it will still display numbers, only the 4 key, + key, = key and clear key work. Starting at 0, can you get the calculator to display 1000? What’s the fastest way, with the fewest button presses? Scroll down for the answer! Brainteaser answer It’s definitely possible…

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by David, 25 July 2018 | 0 comments

Twenty years ago, my mum was twice my age. I’m 42 years old. How old is my mum?

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by David, 11 July 2018 | 0 comments

Tomas is putting a number on a letterbox. He puts on one digit. Then he adds another digit. Tomas looks at it and notices that it makes a number exactly five times the first digit. Tomas adds a third and final digit. Once again, Tomas looks at the number and notices that the three digit…

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by David, 27 June 2018 | 0 comments

Kelly has a pet store. She recently got in a whole litter of puppies and tried to sell them all. On the first day, she sold half of the puppies, plus half a puppy.

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by David, 13 June 2018 | 4 comments

I caught a bus the other day with a very interesting number.

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by David, 30 May 2018 | 0 comments

I want to find a number that is divisible by three. I also want all of its digits to be 8s. Does my number exist?

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by David, 16 May 2018 | 0 comments

You probably know that half of 12 is six. But the other day, I caught a glimpse of a clock peeking between buildings. At that moment, I noticed that sometimes, half of 12 is seven. How is this possible?

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