line up the decimal point when your adding and subtracting.
add annex a zero when you have extra number.
sometimes you can use a number line.
Chat with our AI personalities
David Missoula's
to subtrct integers ,rewrite as adding opposites and use the rules for addtion of integers..
Adding integers, if they have the same sign, add their absolute values and keep the same sign. Subtracting, change the sign of the 2nd number and the add using rules of addition. Multiplying and dividing, Divide the absolute values, if the signs are the same the answer is positive, if the signs are different the answer is negative.
There are several rules for decimals, depending on what you want to do.
When subtracting negative numbers change the subtraction sign to a plus and change the second number (which would appear to be positive) to a negative. ex. -14 - 7=?/-14 + -7= -21 When adding negative numbers just add them as they appear. ex. -2 + -5= -7