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Just think of addition and subtraction as directions on the number line. There are also several rules and properties that define how to perform these basic operations. To add integers having the same sign, keep the same sign and add the absolute value of each number. To add integers with different signs, keep the sign of the number with the largest absolute value and subtract the smallest absolute value from the largest. Subtract an integer by adding its opposite. Watch out! The negative of a negative is the opposite positive number.
How to subtract in Excel. The way to do subtraction is pretty much the same as for addition: just replace the + with a minus sign. For the simple calculation, just select a cell and type = then click on the first cell, type a â and then click on the second cell. Press Enter and the result will be displayed. Unlike the SUM function for adding multiple cells and cell ranges, there is no subtract function in Excel. You can subtract multiple cells by entering a formula such as =B1-B2-B3-B4 if you need to, or you could achieve the same thing by using the formula =B1-SUM(B2:B4) You might have to use your GCSE maths skills if you want to combine addition and subtraction with multiplication and division in the same formula.