Introduction to Algebra

Gap-fill exercise

  
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. Any number multiplied by zero is .
2. For any number a, 1 * a = .
3. The letters which are used to represent or replace numbers are called .
4. For any two literals a and b, a + b = .
5. For any literal a, a + 0 = .
6. For any three literals a, b and c, (a + b)+c = .
7. is known as the additive identity.
8. State True/False : Commutativity and associativity of subtraction are not true for literals.
9. Multiplication of literals is and .
10. For any two literals a and b, ab = .
11. For any three literals a,b and c, (ab)c = .
12. For any literal a, a * 1 = .
13. is known as the multiplication identity.
14. For any three literals a, b and c, a(b+c) = ab + ac. This is called
15. For any three literals a, b and c, (b+c)a = .