Short Problems

Quiz Questions

Stage: 3 Short Challenge Level: Challenge Level:1

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

Jenny's Logic

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

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

Mini Kakuro

Stage: 3 Short Challenge Level: Challenge Level:1

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

Newspaper Sheets

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

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

Central Sum

Stage: 3 Short Challenge Level: Challenge Level:1

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

12345

Stage: 3 Short Challenge Level: Challenge Level:1

Weekly Problem 50 - 2011
Repeat a pattern of numbers to form a larger number. Can you find the sum of all the digits?

Digit Deletion

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

Weekly Problem 14 - 2010
What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?

Alberta's Age

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

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

Double with 1 to 9

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

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