I means that such button has two options.
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The INV button is the same as the SHIFT button on the top left corner of the buttons (the leftmost button under the screen).
Two ways. Easy way first. Simply push the S-D button. This will toggle fractions and decimals. More permanent way: SHIFT SETUP (also the MODE button) 2 (Select option 2 Line 10) That's it! When you want to go back to fractions then: SHIFT SETUP 1 (Selection option 1 Mth 10) Now your back in fraction mode.
Select operation is done by selecting an icon with the middle or left mouse button. However, the left button is only used to see the menu option, and any operations that can be applied to the selected icon.
The answer is 112. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 89999113. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.