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Using the OGT Calculator
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The key you will need to multiply rational numbers with your calculator is
the fraction key
. 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.You can also change mixed number to improper fractions and improper fractions to mixed numbers using the inverse key 
which is the
second key in the first row, and the fraction key 
.Also 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. |
Proper Fractions
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3 x 9 =
10 11
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Key Strokes:
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Display: 27
110 |
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Answer:
27/110
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Improper Fractions
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-7 x 28 =
4 21
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Key Strokes:
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(The calculator will change improper fractions
into mixed)
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Display: -2 _1
3 |
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Answer: -2
1/3
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Do not clear the answer from the calculator.
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To change the answer into an improper fraction use
then 
. |
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Keystrokes:
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Display: -7
3 |
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Answer:
-7/3
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Mixed Numbers
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You do not have to change mixed numbers to improper fractions before
multiplying using the calculator, you can input them as mixed numbers using
the
. |
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-4
5 x
7
11
9 20
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Keystrokes:
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Display: -34 _ 71
180 |
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Answer: -34 71/180
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Do not clear the answer from the calculator
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To change the answer into an improper fraction use
then 
. |
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Keystrokes:
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Display: -6191
180 |
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Answer: -6191/180
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Integers
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If you are multiplying an integer by a fraction you do not have to change the
integer into fraction form with the calculator.
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4 x 6 =
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9
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Key Strokes :
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Display: 2 _2
3 |
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Answer: 2
2/3
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Do not clear the answer from the calculator
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To change the answer into an improper fraction use
then 
. |
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Keystrokes:
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Display: -7
3 |
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Answer:
-7/3
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Decimals
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When using the calculator you do not have to change decimals to fraction
form, but remember your answer will be in decimal form.
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7.38 x -9 =
11
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Keystrokes:
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Display: -6.038181818
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Answer: -6.04
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Make sure you read the directions to determine how many decimal places to
round to, but 2 places after the decimal will usually be sufficient.
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Decimal over Decimal
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In the following problem you are not multiplying by a rational number. But
since the fraction bar also represents a division problem there is no need to
panic, you can easily use your calculator to find the answer. All you have to
do is use the division key
instead of the fraction key 
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3.67 x 9.25 =
11.27
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Keystrokes:
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Display: 3.12200532
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Answer: 3.12
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Make sure you read the directions to determine how many decimal places to
round to, but 2 places after the decimal will usually be sufficient.
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