SaiBook.us Algebra

Example

Title: Subtracting signed numbers

Grade: 6-a Lesson: S1-L3

Explanation: The best way to understand algebra is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

subtract 7 from 12:

Step 1a

Identify the signs:

Explanation: 12 and -7.

Step 1b

Subtract the absolute values:

Explanation: \$|12| - |7| \$= 12 - 7 = 5.

Step 1c

Determine the sign:

Explanation: Since 12 is positive, the result is +5.

subtract 8 from 3

Step 2a

Identify the signs: 3 and -(8).

Explanation: 3 and -(8).

Step 2b

Subtract the absolute values:

Explanation: \$|3| - |8| \$ = 3 - 8 = -5.

Step 2c

Determine the sign:

Explanation: Since 8 is larger and negative, the result is -5.