You can practice addition and subtraction of negative and positive numbres with this applet. Change the numbers and the sign and look at the answer in the line

1. Use the applet to solve these operations:[br]a) (-2) + 6 = [br]b) 1 - (-7) = [br]c) (-2) - 7 =[br]d) 7 - 5 = [br]e) 8 - (-2) = [br]f) (-1) - 0 =[br]g) (-1) - (-2) = [br]h) (-2) + 5 = [br]i) (-6) + 2 =[br]j) 7 - 4 = [br]k) 8 - (-2) = [br]l) (-5) - (-6) =[br][br]2. Try to write a rule to take out the brackets depending on the sign of the numbers[br]3. In some cases you can see a third arrow. What do you think it means?[br][br][br]Ricardo García Mesa, matesytic@gmail.com