Multiplication and integers

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Presentation transcript:

Multiplication and integers Solve using rules of Multiplication and integers

Numbers have different sign Solve using rules of multiplication and integers Example 1: What is + ( +7 ) – ( +8) First convert two symbols into 1, using rules of multiplication +( +7 )  +7 and -( +8)  -8 Therefore +( +7 ) – ( +8 )  +7 – 8 Now we can solve using rules of integers as given below -7 + 8 Numbers have different sign Using Rule 2 – Subtract the numbers and copy bigger number sign 8- 7 = 1 Bigger number sign is “ – “ Answer : --1

Numbers have different sign Solve using rules of multiplication and integers Example 2: What is -( -5 ) + ( -4) First convert two symbols into 1, using rules of multiplication -( -5 )  +5 and +( -4)  -4 Therefore -( -5 ) + ( -4)  +5 – 4 Now we can solve using rules of integers as given below +5 - 4 Numbers have different sign Using Rule 2 – Subtract the numbers and copy bigger number sign 5- 4 = 1 Bigger number sign is “ + “ Answer : -+1

+( -7 )  -7 Solve using rules of multiplication and integers Example 2: What is +( -7 ) - 5 First convert two symbols into 1, using rules of multiplication +( -7 )  -7 Therefore +( -7 ) - 5  -7 - 5 Now we can solve using rules of integers as given below -7 - 5 Numbers have same sign Using Rule 1- Add the numbers and copy bigger number sign 7+5 = 12 Bigger number sign is “ - “ Answer : - -12

Try these + ( -6 ) - ( -5 ) - ( -4 ) - ( +7 ) - ( +8 ) - ( -3 )