Rational Numbers Test

Result

Rational Numbers Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

If a number “x” is subtracted from its additive inverse then the result is

A
2x

B
-2x

C
0

D
x

Solution

The additive inverse of “x” = -x

According to question, (Additive inverse of x) - x = -x – x

= -2x

Hence, B is the correct answer.
Question 2
1 / -0

Which of the following is correct?

A
Subtraction is commutative for whole numbers

B
Multiplication is not commutative for integers

C
The addition is not associative for whole numbers

D
The addition is associative for integers

Solution

Let -1, 2 and 3 be three integers.

Now, -1 + (2 + 3) = -1 + 5 = -4

(-1 + 2) + 3 = 1 + 3 = 4

Therefore, -1 + (2 + 3) = (-1 + 2) + 3

This is true for all integers.

Therefore, the addition is associative for integers.

Hence, D is the correct answer.
Question 3
1 / -0

Which of the following is neither a positive nor a negative rational number?

A
1

B
0

C
-1

D
2

Solution

0 is neither positive nor negative. Hence, B is the correct answer.
Question 4
1 / -0

Which of the following is the negative of the negative of a rational number?

A
1

B
0

C
-1

D
The number itself

Solution

The negative of the negative of the number = -(-a), for some number a.

-(-a) = a

Hence, D is the correct answer.