Number Factory: Background Information 

Summary  Four numbers presented in a factory. With these numbers and the operations +, , x, and : try to make a calculation that has the given number as answer. You can also use brackets in your calculation. This applet is similar to the applet Number Card. 
Subject  number sense  number, estimation 
Age Group  primary education  middle school (gr. 78) 
Programmer  Michiel Doorman 
Author  Michiel Doorman 
Version  revised version 
© wisweb.nl 2003  2012 