Number System

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. The sum of a positive and a negative integer is the of the two numbers value and the sign of the integer.

2. The sum of two integers is always an integer. This is called property of integers of addition.

3. For any three integers a ,b and c; a+(b+c) =(a+ b)+c. This is called property of integers of addition.

4. For any two integers a and b; a+b =b+a. This is called property of integers of addition.

5. is called the additive identity.

6. for any integer a, is the additive inverse.

7. Every subtraction statement has a corresponding statement.

8. To subtract an integer from another, add the of the integer which is to be subtracted.

9. The difference of two integers is always an .

10. For any two integers a,b. Closure property is and commutative property is for integers on subtraction.

11. If the integers -15,12,-17,5,-1,-5,6 are marked on the number line then the integer on the extreme left is .

12. Complete the following pattern :5 0,,30,20,,0,-10,,,-40,,.