
Operations with integers I  
INTRODUCTION  
In
this unit, we revise the basic ideas of integers and we use them to practise
the following operations: sums and subtractions. Before starting this unit, students should have studied integers in class in the traditional way. These activities can be used as a complement to reinforce and understand the concepts and the operations better. The numbers that appear
in each window are generated at random. This allows you to use the window
indefinitely and practise a lot of different exercises. Numbers usually
consist of only one digit so the calculations can easily be done mentally. 

OBJECTIVES  

Eduardo Barbero Corral 
Spanish Ministry of Education. Year 2007  
Except where otherwise
noted, this work is licensed under a Creative
Common License