A Glossary of Common Words
This list includes various words and phrases that the children entering Problem Challenge are assumed to understand. We advise teachers to ensure that all children are familiar with their meanings before the start of the Problem Challenge competition. You may wish to review these terms before each Set.Perimeter  The boundary of a shape. Also, the distance measured around a shape. 

Whole number  A number from the set {0, 1, 2, 3, 4, ...}. 

Counting number  A number from the set {1, 2, 3, 4, ...}. 

Sum  The result of adding two or more numbers together. 

Product  The result of multiplying two or more numbers together. 

Multiple  A multiple of a number is the product of that number with a whole number. 

Divisible  A whole number is divisible by another number if the first is a multiple of the second. 

Factor  If a whole number is divisible by another whole number, the second is a factor of the first. 

Prime number  A whole number greater than 1 whose only factors are 1 and the number itself. 
