Besides arithmetic calculations, we can use units and convert from one unit to another unit.  To  key-in the first entry, Use [( )], 2+2/3, [Units], soft-key [Units], vertical menu “Volume” selection, fly-out scroll “cu” [*] [( )] 1//2.

Shown is the Prime’s convert command, CONVERT. In the screen it is shown being used twice. We prefer its abbreviated (alternate) form. It allows us to convert a measurement from one unit to another.  We will discuss its format in the denominate measurement page. Pressing [Enter] twice allows us to display result in two forms. The [a b/c]  key toggles the form of the result. The first entry displayed a parenthesis around the 1/2 when it was re-entered.

Shown are two solve commands given on the Introductory page. The first solve command raises a quantity to higher terms. The second solve command decreases a quantity to lower terms. The solve command needs to be used from the CAS view. The sixteen problems on this page are better worked by multiplying by 1 or dividing 1 in 1’s equivalent forms of 2/2, 4/4, 8/8. This screen shows what we can use but using solve is not necessary.

Use the [Toolbox] key, soft-key[CAS], vertical selection “Solve” fly-out “Solve”. Key-in 1[=] [x t theta n] [divide]2 [Enter]. Use same procedure for second solve command.

Since the [divide] key uses fractions to show division, we can use it to enter proper fractions. The other alternate is to use the [Template] key. Because the Order of Operations has division before addition and subtraction both fractional parts will be done before the addition or subtraction. That is the reason for the first three entries we do not need to use parenthesis.

Use the [a b/c] key to toggle answers to form shown. The form were left in various forms to demonstrate this feature of Home view. The fourth entries demonstrates that we must use parenthesis for the subtrahend. Optional for the minuend.  Command line entry will not work because of Order of Operations.

CAS view [a b/c] key behaves differently. It adds new line add bottom of history with either approx or exact function being used. Not as nice as the toggle of result being displayed in same the place.

For addition and subtraction Home view seems to keep parenthesis we add to minuend while CAS view always drop extra symbols from the answer.

Pressing [Enter] to the command line entry will result in the same display if we left it out. It would look the same as shown by entry four in History.

In the screen we demonstrate solving a problem three different ways. First entry we use nested parenthesis to get result of 5 3/4.

Entry two and three we use two steps to get result of 5 3/4. When we select 7+1/2 and soft-key [Copy] it changes to decimal 7.5.

The third method is to do part of calculation in our head. Thus we subtract 31+3/4.

Because the Order of Operations has multiplication and division at same level and operation then determined by left right order we must use parenthesis when the multiplicand is a proper fraction or mixed numeral. Technically true for improper as well but likely not use improper for multiplicand.

Use [a b/c] key to toggle answer to form shown.

For all possibilities use parenthesis to display the composite fraction used for the division operation. Whole number divided by fraction - Fraction divided by a fraction - Fraction divided by whole number.

Next screen show last possibility of Mixed numeral divided by a mixed numeral.

In every situation we had to use parenthesis for command line input but they were dropped in the display in History.  A longer fraction bar was used to correctly display the problem.

In this screen we continue the above screen. Then we work a two step problem. Pressing [Enter] to the command line will result in 400 being displayed.