4 Solve problems of addition and subtraction of fractions and mixed numbers CONDITIONS: Given this subcourse, you will be able to do basic mathematics I (addition, subtraction, multiplication, and division) STANDARD: You must answer 70 percent of the written exam questions correctly to receive credit for this subcourse
M stands for Multiplication A stands for Addition S stands for Subtraction When solving problems involving the order of operations, remember the following: 1 The parenthesis ( ) tell which operation to do the first After working inside the parenthesis, you must do multiplication and division before addition and subtraction 2
Subtraction: Change the subtraction sign to addition, and flip the sign of the second number Then add the numbers (This is the definition of subtraction or two-stroke rule ) 7?4 becomes 7+(?4)=3 ?7?(?4) becomes ?7+4=?3 ?7?4 becomes ?7+(?4)=?11
multiplication comes before addition and subtraction Multiply 3 • 8 7 – 5 + 24 Now, add and subtract from left to right 7 – 5 comes first 2 + 24 = 26 Finally, add 2 + 24 Answer 7 – 5 + 3 • 8 = 26 When you are applying the order of operations to expressions that contain fractions,
Subtraction Key Words Multiplication Key Words Division Key Words minus times quotient the same as add decrease or decreased by total split equals and
If the signs are different the result is negative Multiplication examples: POS POS POS = χ POS NEG
subtraction, multiplication, division, and exponents), there is an order that determines Before you get to the operations themselves, make sure that all the