Tag Archives: Arithmetic

[Soln] 2016 Japan Math Olympiad Preliminary Problem 1

2016 JMO Prelim 1. Calculate the value of and answer in the form of an integer.

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2016 Japan Math Olympiad Preliminary Problem 1

2016 JMO Prelim 1. Calculate the value of and answer in the form of an integer.

Posted in Grade 12, Japan | Tagged , , , | Leave a comment

[Soln] 2015 USA NIMO Problem 7

2015 USA NIMO 7. Find the number of ways a series of + and – signs can be inserted between the numbers 0, 1, …, 12 such that the value of the resulting expression is divisible by 5.

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2015 USA NIMO Problem 7

2015 USA NIMO 7. Find the number of ways a series of + and – signs can be inserted between the numbers 0, 1, …, 12 such that the value of the resulting expression is divisible by 5.

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[Soln] Arithmetic fill in the squares

Using all the digits from 1 to 9, fill in the squares to fit the stated totals. (Credits: I learnt of this problem from Guiseppi Butel on brilliant.org.)

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[Hints] Arithmetic fill in the squares

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Arithmetic fill in the squares

Using all the digits from 1 to 9, fill in the squares to fit the stated totals. (Credits: I learnt of this problem from Guiseppi Butel on brilliant.org.)

Posted in Random | Tagged | Leave a comment