G8-Rationals-Review(1)

Rational numbers are not closed under which of these operations?

• Addition

• Subtraction

• Multiplication

• Division

Answer explanation

example:

2 /3 and 0 are rational.

But 2/3 by 0 is not.

Since, Division by 0 not allowed.

Zero has (a)   reciprocal.

The rational numbers that are equal to their reciprocals

• 1

• 1 and 0

• -1 and 1

• -1 and 0

The additive inverse of -5/3 is

• 3/5

• -3/5

• 5/3

• 0

The multiplicative inverse of -1 is

• 1

• -(1/1)

• -1/-1

• 0

The rational number that is equal to its negative is

(a)  

The greater number among 1/4 and 5/4?

• 1/4

• 5/4

The number farther away from 0 is

• -3/4

• 5/2

Compare 2/3 and 4/5.

• 2/3 < 4/5

• 2/3 > 4/5

• 2/3 = 4/5

A rational between -3 and -4 is

• 7/2

• -7/2

• -9/2

• 9/2