Examples with solutions for Absolute value: Identifying Number opposites

Exercise #1

Are the numbers opposite?

56,5.6 \left|56\right|,\left|-5.6\right|

Video Solution

Step-by-Step Solution

To solve this problem, we shall first evaluate the absolute value of each given number.

  • Step 1: Calculate 56\left|56\right|. Since the absolute value of a number is its distance from zero on the number line without regard to sign, 56=56\left|56\right| = 56.

  • Step 2: Calculate 5.6\left|-5.6\right|. Similarly, 5.6\left|-5.6\right| is the magnitude of 5.6-5.6, hence 5.6=5.6\left|-5.6\right| = 5.6.

Now that we have evaluated the absolute values:

  • 56=56\left|56\right| = 56
  • 5.6=5.6\left|-5.6\right| = 5.6

We compare the obtained results to check if they are opposites. By definition, opposites are numbers that are equal in magnitude but different in sign. However, since absolute values are always non-negative, the idea of "opposites" does not apply directly to absolute values. In this context, we check if their magnitudes are the same.

Clearly, 5656 is not equal to 5.65.6. Therefore, the numbers 56\left|56\right| and 5.6\left|-5.6\right| are not opposites.

The correct answer is No.

Answer

No

Exercise #2

Are the numbers opposite?

13,31 \left|-\frac{1}{3}\right|,\left|\frac{3}{1}\right|

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Compute the absolute value of each given number.
  • Step 2: Determine if the numbers are opposites based on their absolute values.

Now, let's proceed step-by-step:

Step 1: Calculate the absolute values.
The absolute value of a number gives its distance from zero on the number line, disregarding its sign.

13\left|-\frac{1}{3}\right|
The negative sign is removed by the absolute value, so:
13=13 \left|-\frac{1}{3}\right| = \frac{1}{3} 31 \left|\frac{3}{1}\right|
The absolute value remains the same as there is no negative sign:
31=3 \left|\frac{3}{1}\right| = 3

Step 2: Determine if the numbers are opposites.

Two numbers are considered opposites if their sum equals zero. In this case, we compare the results:

The absolute values we found were 13 \frac{1}{3} and 3 3 . These numbers do not meet the condition for being opposites since their sum 13+3=103 \frac{1}{3} + 3 = \frac{10}{3} is not equal to zero.

Therefore, the numbers are not opposites.

Therefore, the correct answer is No.

Answer

No

Exercise #3

Are the numbers opposite?

3,3 \left|-3\right|,\left|3\right|

Video Solution

Step-by-Step Solution

To determine if the numbers are opposites, consider the following:

  • Step 1: Calculate the absolute values:
    • 3=3\left|-3\right| = 3
    • 3=3\left|3\right| = 3
  • Step 2: Evaluate whether these numbers are opposites.

For two numbers to be opposites in a mathematical context, they must be equidistant from zero on the number line but in opposite directions. Since both calculations give us 3 3 and 3 3 , they are the same numbers, not opposites.

Therefore, the answer to the question is No.

Answer

No

Exercise #4

Are the numbers opposite?

801,+801 -\left|-801\right|,\left|+801\right|

Video Solution

Step-by-Step Solution

To solve this problem, we will evaluate each expression involving absolute value separately and then determine if they are opposites.

  • Step 1: Evaluate the absolute value of -801:
    801=801\left|-801\right| = 801 because the absolute value is the positive value or magnitude of the number.
  • Step 2: Evaluate the absolute value of +801:
    +801=801\left|+801\right| = 801 since the absolute value of a positive number is the number itself.
  • Step 3: Negate the result of the first step:
    801=801-\left|-801\right| = -801.
  • Step 4: Compare 801-801 and 801801:
    These numbers have the same magnitude (801) but opposite signs.

Therefore, the numbers 801-\left|-801\right| and +801\left|+801\right| are indeed opposites.

The correct choice is Yes.

Answer

Yes

Exercise #5

Are the numbers opposite?

81,92 -\left|-81\right|,\left|9^2\right|

Video Solution

Step-by-Step Solution

To solve this problem, let's proceed with the required steps:

  • Step 1: Calculate the absolute value 81\left|-81\right|.
    81=81\left|-81\right| = 81.
  • Step 2: Apply a negative sign to 81\left|-81\right|:
    81=81-\left|-81\right| = -81.
  • Step 3: Calculate the absolute value 92\left|9^2\right|.
    First, evaluate 92=819^2 = 81, so 81=81\left|81\right| = 81.
  • Step 4: Compare 81-81 and 8181.
    The numbers 81-81 and 8181 are indeed opposites since one is the negative of the other.

Therefore, the solution to the problem is Yes, the numbers are opposites.

Answer

Yes

Exercise #6

Are the numbers opposite?

7,7 \left|-7\right|,\left|7\right|

Step-by-Step Solution

The opposite of a number is the number with the same magnitude but different sign. The absolute value of a number is always positive or zero. Let's examine the given numbers:

7 \left|-7\right| represents the absolute value of -7, which is 7.

7 \left|7\right| represents the absolute value of 7, which is also 7.

Since both absolute values are equal and positive, they represent the same number, not opposites. Therefore, they are not opposite numbers.

Answer

No

Exercise #7

Are these numbers opposite?

5,5 \left|-5\right|,\left|5\right|

Step-by-Step Solution

The opposite of a number is defined as the number with the same absolute value but different signs.

We have:

5=5 \left|-5\right| = 5 and 5=5 \left|5\right| = 5 .

Both these absolute values are equal and positive, meaning they are the same number, not opposites. Therefore, the numbers are not opposite.

Answer

No

Exercise #8

Are the numbers opposite?

123,+123 -\left|-123\right|,\left|+123\right|

Step-by-Step Solution

The opposite of a number is what you add to a number to get zero. The opposite of a positive number is a negative number. And the opposite of a negative number is a positive number.

For instance, the opposite of the number 123123 is 123-123.

In this question, we are asked about 123-\left|-123\right| and +123\left|+123\right|.

The absolute value of any number, whether positive or negative, is its distance from zero on the number line, without considering the direction. Thus, +123=123\left|+123\right| = 123 and 123=123\left|-123\right| = 123.

Therefore, 123=123-\left|-123\right| = -123 and +123=123+\left|123\right| = 123.

Since 123-123 is indeed the opposite of +123+123, the correct answer is Yes.

Answer

Yes

Exercise #9

Are the numbers opposite?

56,+56 -\left|-56\right|,\left|+56\right|

Step-by-Step Solution

The opposite of a number is what you add to a number to get zero. The opposite of a positive number is a negative number. And the opposite of a negative number is a positive number.

For instance, the opposite of the number 5656 is 56-56.

In this question, we are dealing with 56-\left|-56\right| and +56\left|+56\right|.

The absolute value of a number is the distance from zero, which is always positive. Hence, +56=56\left|+56\right| = 56 and 56=56\left|-56\right| = 56.

Therefore, 56=56-\left|-56\right| = -56 and +56=56+\left|56\right| = 56.

Thus, 56-56 and 5656 are opposites, and the answer is Yes.

Answer

Yes

Exercise #10

Are these two numbers opposites?

64,82 -\left|-64\right|, \left|8^2\right|

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Calculate the absolute value of 64-64.
  • Step 2: Apply the negative sign to the absolute value calculated.
  • Step 3: Calculate the absolute value of 828^2.
  • Step 4: Compare the two numbers to determine if they are opposites.

Now, let's work through each step:

Step 1: Calculate 64\left|-64\right|.
The absolute value of 64-64 is 64=64|-64| = 64.

Step 2: Apply the negative sign to this absolute value.
64=64 -\left|-64\right| = -64

Step 3: Calculate 82\left|8^2\right|.
First, compute 82=648^2 = 64. Then, calculate 64=64|64| = 64.

Step 4: Compare the numbers.
We have 64-64 from Step 2 and 6464 from Step 3. These two numbers are opposites because the opposite of 6464 is 64-64.

Therefore, the two numbers are indeed opposites.

Answer

Yes

Exercise #11

Are these expressions opposites?

3+5  and  8 -\left|3 + 5\right| \; \text{and} \; \left|-8\right|

Step-by-Step Solution

Let's solve the problem by evaluating the given expressions and checking if they are opposites:

  • First, evaluate 3+5-\left|3 + 5\right|:
    • Calculate 3+53 + 5: 3+5=83 + 5 = 8.
    • Find 8\left|8\right|: 8=8\left|8\right| = 8.
    • Evaluate 8-\left|8\right|: 8=8-\left|8\right| = -8.
  • Next, evaluate 8\left|-8\right|:
    • Since 8-8 is negative, 8=8\left|-8\right| = 8.
  • Compare the results: 8-8 and 88 are indeed opposites as 8=1×8-8 = -1 \times 8.

Therefore, the expressions 3+5-\left|3 + 5\right| and 8\left|-8\right| are not opposites according to standard mathematical convention.

No

Answer

No

Exercise #12

Are the expressions equal?

25+5  and  20 \left|-25 + 5\right| \; \text{and} \; \left|20\right|

Step-by-Step Solution

First, let's evaluate both expressions separately.

Calculate 25+5\left|-25 + 5\right|:

  • First, simplify inside the absolute value: 25+5=20-25 + 5 = -20.
  • Now take the absolute value of 20-20: 20=20\left|-20\right| = 20 because the absolute value of a negative number is its positive equivalent.

Now, calculate 20\left|20\right|:

  • The number 2020 is already positive, so 20=20\left|20\right| = 20.

Both expressions evaluate to 2020, which means they are equal.

So, the correct answer to the problem is Yes \text{Yes} .

Answer

No