### Follow me on Twitter

My Tweets-
### Recent Posts

### Archives

### Categories

- Advice (3)
- Azerbaijan (4)
- Blog matters (12)
- Canada (6)
- Grade 10 (35)
- Grade 12 (126)
- Grade 8 (51)
- Intl/Regional (21)
- Japan (6)
- Kazakhstan (14)
- Moldova (4)
- Random (72)
- Romania (6)
- Scotland (1)
- Singapore (75)
- Spain (2)
- Sports & Games (3)
- UK (2)
- Undergraduate (15)
- USA (99)

### Tags

### Meta

# 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.

## 2016 Japan Math Olympiad Preliminary Problem 1

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

## [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.

## 2015 USA NIMO Problem 7

## [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.)