


Decimal ArithmeticSubtractionAll Positive  Small minus Large  Signed Decimals All PositiveSubtracting one decimal from the other is similar to addition. Two positive decimal numbers may be subtracted as follows:
To begin with given are examples where the numbers being subtracted are positive and the answer will be positive. ExampleLet us calculate: 123.45  37.5 Example
ExercisePerform the following subtractions without using a calculator: Small positive number minus large positive numberSubtracting a large number from a small number will always give a negative number, the opposite of subracting the small number from the large number. This can be written: a − b = −(b − a) ExampleCalculate 11.6 − 18.0 without using a calcuator. This is the opposite of 18.0 − 11.6 which equals 6.4. Hence 11.6 − 18.0 = −6.4 ExercisePerform the following subtractions without using a calculator: Subtracting Signed Decimal NumbersThis section assumes you are already familiar with subtraction for integers. The things to remember are summarised here.
ExamplesWe show application of these rules to signed decimal numbers.
ExerciseTry these exercises with signed decimal numbers without using a calculator.
<< Addition  Decimals Index  Multiplication >>
