On your TI-83 or TI-84,
Type this sequence of 10 key strokes:
3
/
4
- <--[ that's the minus key -, not the negative key (-) ]
1
/
2
MATH
ENTER
ENTER
Then read the fraction answer.
Edwin
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website! 3/4-1/2
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For problems like this with 2 terms:
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I remember the LCD, Least Common Denominator from grade school.
It's a waste of time.
It's not relevant to this example, but is for some other problems.
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For example:
The LCD is 12, but there's no good reason to waste time finding it.
Use the product of the 3 DENs': 4*3*6 = 72
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Then reduce.
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Another example:
Use the product:
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Using the product and reducing the result takes less time than finding the LCD in most cases.
IDK why schools and texts persist with the LCD.