![]() ![]() This means the number of marbles increased because we had to add positive numbers. Sally had 3 marbles and she got 4 more from her brother. Let us understand this with the help of an example using the rules given above.Įxample: Sally had 3 marbles. However, in the case of integers, the addition operation might lead to an increase or decrease in the value of the given number. This will result in -2 + (+4) = 2.Īddition generally means to increase the value. ![]() For example, -2 - (-4) can be written as -2 + (+4) and then the rule for the addition of integers can be applied. The subtraction fact can be written as an addition fact and the sign of the subtrahend needs to be reversed. ![]() For example, 4-(-5) can be written as 4 + (+5) and then it can be solved similarly, -6 - (+4) can be written as -6 + (-4) and then it can be solved. Then, we can use the rule of addition of integers. The subtraction fact can be changed to an addition fact and the sign of the subtrahend needs to be reversed. Subtraction of a positive number and a negative number We find the difference of the absolute values of both the numbers and keep the sign of the greater number with the answer. Then, we can use the rules for the addition of integers. The following table shows the rules of subtraction also to ease out our calculations while dealing with operations on integers. If both the numbers are of different signs, then we find the difference of the absolute numbers and place the sign of the bigger number in the result. This means if both numbers are of the same sign, then we add the absolute values and attach the common sign. After this step, we can simply apply the rules of the addition of integers. In other words, subtraction of integers is done by changing the sign of the subtrahend. So, a subtraction fact can be written as an addition fact. We know that addition and subtraction are inverse operations. While adding two negative numbers, we take the sum of both the numbers and attach a negative sign with the answer. While adding a positive and a negative number, we take the difference of the absolute values of both the numbers and attach the sign of the greater number with the answer. While adding two positive numbers we simply add both the numbers and get an answer which is a positive value, just like the addition of whole numbers.Īddition of a positive number and a negative number The following table shows the rules for adding integers. ![]()
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