Casio fx-260
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The Casio fx-260 Calculator
H
ere is what the Casio fx-260 Solar Calculator looks like:
©2015 by Essential Education. You are licensed one copy of this document for personal use only. Any other reproduction or redistribution is prohibited. All rights reserved.
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Casio fx-260
Starting Up the Calculator
W
hen you first use the calculator, you’ll want to press the button in the upper right-hand corner. In small letters,
you’ll see DEG at the top of the screen, and you’ll see a 0 in the right of the screen. The calculator has different modes, and you’ll need the DEG mode to use your calculator for the test. If you see something other than DEG in the upper part of the screen, press , and DEG should appear. When you’re done with a problem and starting a new problem, press the
key or press the red
key to clear the
calculator. This will clear all the work you’ve done. Hint: Use the key to clear the last thing you entered or the
key to erase
just one number you’ve entered.
Basic Adding, Subtracting, Multiplication, and Division
T
o do basic math problems, just enter the math problem as you see it or as you would write it. The calculator knows the
order of operations, so you can enter the problem exactly as you see it, with any combination of operations. When you’re done, press the equal
key to get the answer. It won’t give you the
answer until you press the equal
key!
EXAMPLE 5+3×4
1. Press
or
©2015 by Essential Education. You are licensed one copy of this document for personal use only. Any other reproduction or redistribution is prohibited. All rights reserved.
Casio fx-260
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2 . Press 3. The answer, 17, should appear on the screen. Notice that the calculator applies the order of operations. It multiplies three and four before it adds five.
Math Problems That Use Parentheses
P
arentheses in math problems indicate a part of the problem that needs to be done first. Luckily, the Casio fx-260 can use
parentheses, so you can enter a problem with parentheses into the calculator, and it’ll do the work for you. The open and close parentheses buttons look like this:
.
EXAMPLE (2 + 9) × (44 − 3)
1. Press
or
2 . Press 3. The answer, 451, should appear on the screen. Sometimes, a number that’s meant to be multiplied with an expression that’s in parentheses just appears next to the parentheses, without a multiplication symbol. When you enter the problem, you’ll need to add a multiplication symbol.
©2015 by Essential Education. You are licensed one copy of this document for personal use only. Any other reproduction or redistribution is prohibited. All rights reserved.
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Casio fx-260
EXAMPLE 5(2 + 9) This means to multiply 5 times the sum of 2 and 9
1. Press
or
2 . Press 3. The answer, 55, should appear on the screen. Square Roots
T
he calculator can find the square root of a number or of an expression. To find a square root, first enter the number (or
expression in parentheses), then press the
left of the calculator, and then press the square root sign appears above the button:
key in the upperkey in the top row. A , to show that the
function of that key is to find the square root. Remember, press first, then
. Don’t press them at the same time.
EXAMPLE
— What is the square root of 25? or √25
1. Press
or
2 . Press 3. The answer, 5, should appear on the screen. ©2015 by Essential Education. You are licensed one copy of this document for personal use only. Any other reproduction or redistribution is prohibited. All rights reserved.
Casio fx-260
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EXAMPLE
——— What is the square root of 45 + 4? or √45 + 4
1. Press
or
2 . Press 3. The answer, 7, should appear on the screen. Negative Numbers
N
egative numbers can be quite a problem, because it’s easy to forget about a negative number sign. Make sure, when
you’re using negative numbers, to enter them properly into your calculator. To enter a negative number, first enter the number and then press the
key, which changes the sign of the number.
EXAMPLE 10 + −4
1. Press
or
2 . Press 3. The answer, 6, should appear on the screen.
©2015 by Essential Education. You are licensed one copy of this document for personal use only. Any other reproduction or redistribution is prohibited. All rights reserved.
