Chapter 1 - Section 1.3 - Calculator Explorations - Adding and Subtracting Numbers - Page 25: 1

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To add numbers on a calculator, first locate the buttons marked +, and = or ENTER. To add two numbers, input the first number you wish to add, then press the + button. Then input the second number you wish to add, then press the = or ENTER button. To add 89+45, press the following buttons in the following order: 8, 9, +, 4, 5, =