These lessons help GCSE/IGCSE Maths students learn about directed numbers and how to perform operations on directed numbers.
How to add and subtract directed numbers?
Rule 1: If the signs are the same then add the numbers and keep the original sign.
Rule 2: If the signs are different then subtract: Big number minus small number. Keep the sign of the big number.
How to multiply and divide directed numbers?
Rule 1: The answer is positive when all the numbers are positive or when there is an even number of negative signs in the problem.
Rule 2: The answer is negative when there is an odd number of negative signs in the problem.
The following diagram gives the rules for the addition, subtraction, multiplication and division of directed numbers. Scroll down the page for more examples and solutions on the operations for directed numbers.
Directed Numbers Adding and Subtracting
Directed Numbers Multiplying and Dividing
Rules for adding, subtracting, multiplying and dividing positive and negative numbers
GCSE Maths - Negative Numbers (Adding, Subtracting,Multiplying, Dividing)
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