TI-89 Exact/Approx Answers: How to Get Approximate Results with "AUTO" Mode

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In summary, to get approximate answers with the Exact/Approx set to "AUTO" in the mode menu, simply put a decimal in one of the numbers before pressing ENTER to solve. If you forget, or if you want to convert an exact number answer to a decimal, just multiply it by 1. Both methods will work.
  • #1
cscott
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With the Exact/Approx set to "AUTO" in the mode menu, how can I get approximate answers without going and switching it to approx then recalculating?
 
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  • #2
Before you press ENTER to solve, press the Diamond button.
 
  • #3
Woot! Thanks!
 
  • #4
cscott said:
With the Exact/Approx set to "AUTO" in the mode menu, how can I get approximate answers without going and switching it to approx then recalculating?

Put a decimal in one of the numbers, i.e., instead of entering 4 / 3, enter 4. / 3. If you forget, or if you an exact number answer that you want converted to a decimal, just x (times) 1.

Try both to see how they work!

Regards,
George
 
  • #5
George Jones said:
Put a decimal in one of the numbers, i.e., instead of entering 4 / 3, enter 4. / 3. If you forget, or if you an exact number answer that you want converted to a decimal, just x (times) 1.

Try both to see how they work!

Regards,
George

Cool. Thanks for the alternatives.
 

1. What is the difference between an exact and an approximate answer on TI-89?

An exact answer on TI-89 is a solution that is represented as a simplified mathematical expression, while an approximate answer is a decimal or numerical value that is rounded to a specific number of decimal places.

2. How do I switch between exact and approximate answers on TI-89?

To switch between exact and approximate answers on TI-89, you can press the "Exact" or "Approx" button on the calculator, or use the shortcut keys "Ctrl+Enter" for exact answers and "Ctrl+0" for approximate answers.

3. Can I change the number of decimal places for approximate answers on TI-89?

Yes, you can change the number of decimal places for approximate answers on TI-89 by going to the "Mode" menu and selecting "Exact/Approx" options. From there, you can choose the desired number of decimal places.

4. How do I know if the answer on TI-89 is exact or approximate?

The answer on TI-89 will be displayed as an exact answer if it is a simplified mathematical expression, and it will be displayed as an approximate answer if it is a decimal or numerical value.

5. Can I use both exact and approximate answers in the same calculation on TI-89?

Yes, you can use both exact and approximate answers in the same calculation on TI-89. Simply use the "Exact" or "Approx" buttons to switch between the two types of answers as needed.

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