## MATH - SCIENCE INTEGRATION

### Using the Calculator

 On the Ohio Graduation Test you will be allowed to use the calculator provided for the test.  In this section you can review the basic operations with the calculator as well as how to input negative numbers and fractions.

### Negative Numbers

 To input a negative number you use the  key in the last row to the left of the  key. You input the number first then the  key. Warning: Do not use the subtraction key  for negative numbers. Example:  -75.93 Keystrokes: Display:  -75.93

### Fractions

 With the OGT calculator you will use the fraction key  to perfrom operations with fractions, when you want a fractional answer.  It is in the third row and the fifth column.  This will allow you to input fractions, both proper and improper, and mixed numbers.  Your solution will be a proper fraction or mixed number but you can also change from a mixed number to an improper fraction. The OGT calculator will also reduce all fraction in your final answer so you do not have to worry about it.

• Proper Fractions
 To input a proper fraction you input the numerator then the fraction key  then the denominator. Example :  4/9 Key strokes: Display:  4  9

• Mixed Numbers
 To input a mixed you input the integer then the fraction key ,the numerator then the fraction key , and then the denominator. Example: 5 19/21 Keystrokes: Display:  5_19  21

• Improper Fractions
 You input an improper fraction the same way you do a proper fraction.  To input an improper fraction you input the numerator then the fraction key  then the denominator. But the calculatr will turn it to a mixed number. Example:  11/6 Keystrokes: Display:  11  6 Hit any operation key and the calculator will convert the improper fraction to a mixed number. Display:  1_5  6

• Converting
 To convert between mixed numbers and improper fractions you will use the inverse key   which is the second key in the first row, and the fraction key  .

• Improper Fraction to Mixed Number
 Change 8/5 to a mixed number. Key strokes: Display:  1_3  5 Mixed Number: 1  3/5 To convert back to an improper fraction do not clear the display. Keystrokes: Display:  8  5

• Mixed number to Improper Fraction
 Convert 13 9/11  to an improper fraction. Key Strokes: Display:  152  11 Improper Fraction:  152/11 To convert back to a mixed number do not clear the display. Key strokes: Display:  13_ 9 11

• Fraction to decimal
 If you need a decimal answer from a fraction, remember all fractions are division problems, so input it as a division problem. Example:  Change 5/6 to a decimal Keystrokes: Display:  0.833333333 Read the directions from the proplem to determine how many places you need after the decimal point.

 To add use the   which is in the seventh row and the fourth column.

• Integer
 -16 + 142 = Keystrokes: Display:  126

• Decimal
 4.9 + 17.83 = Keystrokes: Display:  22.73

• Fraction
 -7 9/17 + 14/23 = Keystrokes: Display:  8_54  391 Mixed Number:  8 54/391 To covert to an improper fraction, do not clear the display. Keystokes: Display:  3182  391 Improper Fraction:  3182/391

### Subtraction

 To subtract use the   which is in the seventh row and the fifth column. Warning: Do not use the  for subtraction.

• Integer
 -2 - 76 = Keystrokes: Display:  -78

• Decimal
 45.36 - (-24.7) = Keystrokes: Display:  70.06

• Fraction
 - 4/9 - 8/11 = Keystrokes: Display:  -1_17  99 Mixed Number:   -1 17/99 To covert to an improper fraction, do not clear the display. Keystokes: Display:  -116  99 Improper Fraction:  -116/99

### Multiplication

 To multiply use the  key   which is in the sixth row and the fourth column.

• Integer
 -72 x (- 89) = Keystrokes: Display:  6408

• Decimal
 4.6 x 8.62 = Keystrokes: Display:  39.652

• Fraction
 9/5 x 15/18 = Keystrokes: Display:  1_1  2 Mixed Number:  1 1/2 To covert to an improper fraction, do not clear the display. Keystokes: Display:  3  2 Improper Fraction:  3/2

### Division

 To divide use the  key   which is in the sixth row and the fifth column.

• Integer
 16 I - 44 = Keystrokes: Display:  0.363636363 Decimal Form:  0.36 If you need your answer in fractional form you can use the   insted of the   key. Keystrokes: Display:  - 4  11 Fractional Form:  - 4/11

• Decimal
 34.01 I 16 = Keystrokes: Display:  2.125625 Make sure you read the directions of each problem carefully so you will know what decimal place to round your answer to.

• Fraction
 -15 I 5/9 = Keystrokes: Diplay:  27