# Short Problems

### Weekly Problem 25 - 2009

##### Stage: 3 Short Challenge Level:

Jack does a 20-question quiz. How many questions didn't he attempt?

### Weekly Problem 52 - 2009

##### Stage: 2 and 3 Short Challenge Level:

Gar the Magician plays a card trick on his friends Kan and Roo. Can you work out his trick and find out the sum on Kan's cards?

### Weekly Problem 21 - 2008

##### Stage: 3 and 4 Challenge Level:

The sum of each column and row in this grid give the totals as shown. What number goes in the starred square?

### Weekly Problem 29 - 2011

##### Stage: 2 and 3 Short Challenge Level:

From only the page numbers on one sheet of newspaper, can you work out how many sheets there are altogether?

### Weekly Problem 53 - 2011

##### Challenge Level:

Find a number between 100 and 999 that has its middle digit equal to the sum of the other two digits. Can you find all possibilities?

### Weekly Problem 50 - 2011

##### Short Challenge Level:

Repeat a pattern of numbers to form a larger number. Can you find the sum of all the digits?

### Weekly Problem 14 - 2010

##### Stage: 2 and 3 Short Challenge Level:

What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?

### Weekly Problem 26 - 2011

##### Stage: 2 and 3 Short Challenge Level:

Alberta won't reveal her age. Can you work it out from these clues?

### Weekly Problem 31 - 2011

##### Stage: 2 and 3 Short Challenge Level:

Can you find a number and its double using the digits $1$ to $9$ only once each?