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Properties of operations:Commutative law: this applies o...

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The four basic rules of operations for integers are: Addition: sum Subtraction: difference Multiplication: product Division: quotient BODMAS is applied when more than one law in an operation is used, e.g 15 + 7 x 4 - 6 / 3
Properties of operations: Commutative law: this applies only to addition and multiplication. It can only be used when two numbers are involved and order does not matter. Associative law: this applies to addition and multiplication and can only. It can only be used when three numbers are involved and order does not matter. Distributive law: this also applies to addition and multiplication and can be used by either multiplying a number by the sum of two numbers or multiplying first and adding the two products.
The imagine of the number line shows that when a number moves to the right it is bigger and when it moves to the left it becomes smaller. Thus +4+-6= -2. www.google.co.za
Rule 1- if we add the same number to each side of an inequality,the inequality is still true, e.g 2 > -4 2 + 6 > -4 + 6 8 > 2 Rule 2- if we subtract the same number from each side of an inequality, the inequality is still true, e.g 5 > -4 5 - 4 > -4 - 4 1 > -8 Rule 3- if we multiply both sides of an inequality by a positive number, the inequality is still true, e.g -6 > -8 -6 x 6 > -8 x 6 -36 > -48 Rule 4- if we multiply both sides of an inequality by a negative number, the inequality sign must be reserverd, e.g -2 < 3 -2 x -2 > 5 x -2 4 > -10
Test 1. Solve: 20 + 15 x 4 - 15 / 3 2. Use the associative law to calculate: 8(6 + 12) 3. Use the number line to find: 7 - (-9) 4. Do the following calculations for the inequality 9 > -12 a) add 4 to both numbers. b) multiply both numbers by 4. 5. Calculate: 12/5 x 2/3
The video shows laws of addition, subtraction, multiplication and division of improper, proper and mixed fractions. www.youtube.com