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mathematical sciences posts

This code’s for oldies Brainteaser

by David, 12 December 2018 | 0 comments

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If you’re sitting there twiddling your thumbs, see if you can decode this message. If you need a hint, you can always phone a friend! 3666882255533 443355544499 339987772

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Number cruncher Brainteaser

by David, 28 November 2018 | 1 comments

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I have four different whole numbers written on a piece of paper. The largest number is four bigger than the smallest. The middle two numbers are even. If I add all four numbers together, I get 12. What are my numbers?

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Half past angle Brainteaser

by David, 14 November 2018 | 0 comments

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At half-past three, what is the angle between the hands of a clock? Scroll down for the answer!     Brainteaser answer First, a quick estimate. The short hand points across to the three, and the long hand points straight down to the 6. The angle is about 90 degrees, but there’s a more accurate…

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A fish tank on the table Brainteaser

by David, 31 October 2018 | 1 comments

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Jenny had a short, wide fish tank. She wanted to change the water, so she put the fish tank on a table and put a tall bucket on the floor right underneath. She was about to get a hose and siphon the water into the bucket, but before she started, she did some measuring. It…

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Tom’s quilt brainteaser Brainteaser

by David, 17 October 2018 | 0 comments

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Tom’s just finished sewing a quilt! It’s made of lots of equal-sized squares of fabric sewn together. Currently, it’s 12 squares long and six squares wide. Tom tried putting the quilt on his bed, but it’s the wrong shape. He’s decided to make it nine squares long and eight squares wide. Tom wants to break…

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Making change Brainteaser

by David, 3 October 2018 | 0 comments

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Australia has six coins that are commonly used – 5 cents, 10 cents, 20 cents, 50 cents, $1 and $2. How many different ways can you make exactly 50 cents in Australian coins?

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Planning to party Brainteaser

by David, 19 September 2018 | 0 comments

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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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Peter’s staircase Brainteaser

by David, 5 September 2018 | 0 comments

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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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A list of letters Brainteaser

by David, 21 August 2018 | 0 comments

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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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Broken calculator Brainteaser

by David, 8 August 2018 | 4 comments

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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?

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