Choose the correct option : 1: set A = { 1,5,6,7 } and set B = { 0,1,7,15 } . what is the A U B ?

a) A U B = { 0,1,5,6,7,15 }

b) A U B = {0,1,1,5,6,7,15}

c) A U B = { 1,5,6,7,15}

d) A U B = { 1, 7 }

2: which equation shows the identity property of multiplication ?

a) a+a+a+= 3× a

b) ( a + b ) + 4 = a + ( 4 + b )

c) a ( b + c ) = ab + ac

d) a×1 = a

3: which is an example of associative property of addition ?

a) 7+ 0 = 7

b) (3+9) + 8 = 3 + ( 9+ 8)

c) 5 + ( -5 ) = 0

d) 4+ 3 = 3 +4

4: which property of addition is used in the following ?

( 9+8 ) + 5 = 9 + ( 8+ 5 )

a) associative property

b) closure property

c) distributive property

d) commutative property

5: which property is used in the following expression ?

( 2 × 6 ) × 4 = 6 × ( 4 × 2 )

a) distributive property of multiplication

b) commutative property of addition

c) associative property of addition

d) associative property of multiplication

6: which property is used in the following ?

2×( 4+3 ) = 2 x 4 + 2 × 3

a) commutative property

b) distributive property

c) associative property

d) none of the above

7: which is an example of identity property of addition ?

a) (4+6) + 2 = 4 + ( 6 + 2 )

b) 9+ 0 = 9

c) 8× 1 = 8

d) 7+ 4 =4+ 7

8: which of the following does NOT show the commutative property of addition ?

a) ab = ba

b) 3x + 4y = 4y + 3x

c) a+ b =b+ a

d) 8+ x = x + 8

9: which operation will not change the value of any nonzero number ?

a) dividing by zero

b) adding one

c) multiplying by zero

d) multiplying by one

10: which property of addition does 2 + 0= 2 illustrate ?

a) commutative property

b) zero property

c) distributive property

d) identity property