Rule of Subtraction: Change the operation from subtraction to addition, and change the sign of the second number that follows.Ĭase 1: When we need to subtract a positive number from a positive number, we follow the subtraction rule given above. We just need to remember a rule which says: The subtraction of negative numbers is similar to addition. We start from -9 and move 5 numbers to the right that brings us to -4. Observe the following number line and apply the rule on -9 + (+5). The number line rule says, " To add a positive number we move to the right on the number line". This can be understood better with the help of a number line. Since we are using the sign of the greater absolute value, the answer is -4. We can see that when we start from -7 and move 4 numbers to the left, it brings us to -11.Ĭase 2: When a positive number is added to a negative number, we find their difference and use the sign of the larger absolute value in the answer. Therefore, observe the following number line, and apply the rule on -7 + (- 4).
The number line rule says, " To add a negative number we move to the left on the number line". This can be understood with the help of a number line.
In other words, the sum of two negative numbers always results in a negative number. Addition of Negative NumbersĬase 1: When a negative number is added to a negative number, we add the numbers and use the negative sign in the answer. For adding and subtracting negative numbers, we need to remember the following rules.
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