For the ASVAB, you’ll need to know how to add, subtract, multiply, and divide with positive and negative numbers. Positive numbers are numbers that are greater than 0, such as 6 or 142. Negative numbers are numbers that are less than 0, such as –4 or –18. (See the number line below.) The absolute value of a number is the distance of the number from 0 on a number line. For example, the absolute value of –12 is 12.
• To add numbers with the same sign, add their absolute values. The sum will have the same sign as the numbers you added.
• To add numbers with different signs, first find ...