![]() The second function of the key is printed in yellow above the key, and is accessed by pressing the button before pressing the key. The main function of a key is printed in white on the key itself. Many keys on the calculator have more than one use. The keys used to insert brackets into a calculation are in the centre of the row above the number keys. The lower half of the keypad contains the number keys, keys for the basic operations of addition, subtraction, division and multiplication, and the key, which is pressed when you want the calculator to display the result of the calculation you have entered. The bottom row has the mathematical text 3 at the right-hand side, annotated with ‘output’. The middle row of the screen has the mathematical text 1 add 2 at the left-hand side, annotated with ‘input’. The top row of the screen contains the letter D (white text on black) in the centre, and the word ‘math’ with an upward pointing arrowhead towards the right end, and these are annotated with ‘display indicators’. The figure shows the display on a calculator screen with annotations added to explain some of the features. Below these the button labelled Ans is annotated with ‘last answer key’ and the button labelled = is annotated with ‘equals key’. Below these the multiply, divide, add, subtract keys are annotated with ‘basic operation keys’. To the right of these the red button labelled D E L (written as one word) is annotated with ‘delete key’ and the red button labelled A C (written as one word) is annotated with ‘all clear key’. At the bottom left of the calculator an array of twelve buttons is annotated with ‘number keys’. Below these are four rows of black buttons (twenty two buttons in total) with the annotation ‘function keys’. Beneath the display is a row of five blue buttons annotated, from left to right: ‘shift key’ ‘alpha key’ ‘cursor control button’ (this button is much larger and in the centre) ‘mode key’ ‘on key’. The bottom row has the mathematical text 3 square root 6 at the right-hand side. The middle row of the screen has the mathematical text square root 12 multiplied by square root 6 multiplied by square root 3 all over 2 at the left-hand side. The top row of the screen contains the letter D (white text on black) in the centre, and the word ‘math’ with an upward pointing arrowhead towards the right end. The calculator screen at the top, annotated with ‘display’, has three rows. For instance, if we were instead adding 1/3 + 5/6, the first fraction's denominator (3) divides evenly into the second one's denominator (6).The figure shows a photograph of a Casio scientific calculator f x - 83 E S (natural display) with annotations added to explain some of the features. On the other hand, if you can divide one denominator evenly into the other, then you only need to convert one fraction, not both. Now we multiply the top and bottom numbers in both sets of fractions:įrom here, we add the two fractions together as normal, because each one has a new numerator and the same denominator. The number we'd multiply the denominator by in the second fraction is 3, so we replace 1 with 3/3. ![]() We then replace the 1 that we will multiply by fraction A with 4/4. For the first fraction, that number will be 4. The way to even out the denominators in an addition problem is to replace 1 with the number it will take to get the denominator of that fraction to the LCD, divided by itself.įor each fraction in the addition problem, you want to find out what you could multiply the denominator by in order to get the LCD. In the case of the denominators 3 and 4, the LCD is the product of those two numbers: 3 x 4 = 12 Step 2: Multiply Each Fraction By 1 to Find Equivalent Fractionsįun fact: It's okay to multiply each term in an addition problem by 1, because anything multiplied by 1 is just itself. If you can't divide 3 into 4 or vice versa, you'll find the LCD by multiplying the two denominators together. The denominator of the first fraction is 3 and that of the second fraction is 4, and both fractions are in their simplest forms.
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