# Short Problems

### Quiz Questions

##### Age 11 to 14 ShortChallenge Level

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

### Jenny's Logic

##### Age 11 to 14 ShortChallenge Level

Weekly Problem 52 - 2009
How did Jenny figure out that Tom's cards added to an even number?

### Mini Kakuro

##### Age 11 to 14 ShortChallenge Level

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

### Newspaper Sheets

##### Age 14 to 16 ShortChallenge Level

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

### Central Sum

##### Age 11 to 14 ShortChallenge Level

Can you find numbers between 100 and 999 that have a middle digit equal to the sum of the other two digits?

### 12345

##### Age 14 to 16 ShortChallenge Level

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

### Digit Deletion

##### Age 11 to 14 ShortChallenge Level

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

### Alberta's Age

##### Age 14 to 16 ShortChallenge Level

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

### Double with 1 to 9

##### Age 11 to 14 ShortChallenge Level

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