Operations with absolute value: Problem type 1



The absolute value of a number ‘a’ is denoted as |a|

|a| = a, if a is positive

|a| = −a, if a is negative

|0| = 0

Absolute value of a number is the distance of the number on the number line from 0. The absolute value of a number is never negative.

For example, the absolute value of both 5 and −5 is 5. The absolute value of 0 is 0.

Finding absolute value of a number is like removing any negative sign in front of a number, and considering all numbers as positive.

In this lesson, we solve problems involving operations with absolute values.

Evaluate the following

|13 − 19| − |11|

Solution

Step 1:

Simplifying

|13 − 19| − |11| = |−6| − 11 = 6 – 11

Step 2:

It is a subtraction of integers problem

The signs are different. So, we take the difference of absolute values

|−11| − |6| = 11 – 6 = 5

Step 3:

The sign of the numbers with larger absolute value (−11) is −.

We keep this sign with the difference obtained in above step

So, |13 − 19| − |11| = − 5

Evaluate the following

|7 − 23| − |−6|

Solution

Step 1:

Simplifying

|7 − 23| − |−6| = |−16| − 6 = 16 – 6

Step 2:

It is a subtraction of integers problem

The signs are different. So, we take the difference of absolute values

|16| − |−6| = 16 – 6 = 10

Step 3:

The sign of the numbers with larger absolute value (16) is +.

We keep this sign with the difference obtained in above step

So, |7 − 23| − |−6| = + 10



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