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Chapter 2: Problem 89

Add using a calculator. $$302+(-422)$$

Short Answer

Expert verified
-120

Step by step solution

01

Turn on the Calculator

Press the power button to turn on your calculator.
02

Enter the First Number

Type in the number 302 on your calculator.
03

Input the Addition Operation

Press the '+' button to choose the addition operation.
04

Enter the Second Number

Type in the number -422 (negative four hundred twenty-two) on your calculator.
05

Perform the Calculation

Press the '=' button to perform the calculation and see the result.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Basic Arithmetic Operations
In mathematics, arithmetic is the branch that deals with basic number operations. These include addition, subtraction, multiplication, and division.
Addition combines two or more numbers to get a sum. Subtraction finds the difference between two numbers. Multiplication calculates the total of one number taken multiple times. Division splits a number into equal parts.
For example, in the given exercise, we use addition. We're adding 302 and -422. It's important to understand how these basic operations function, as they are the foundation of many more complex math topics.
Negative Numbers
Negative numbers are numbers less than zero. They are represented with a minus sign (-). Understanding negative numbers is crucial for correctly performing arithmetic operations.
When adding negative numbers, think of it as moving left on a number line. For instance, adding -422 to 302 means starting at 302 and moving 422 units to the left, ending at -120.
  • If both numbers are positive, the sum is positive
  • If both numbers are negative, the sum is negative
  • If one number is positive and the other is negative, the sum depends on their absolute values
In the example, 302 and -422 sum to -120 because moving left 422 units from 302 crosses zero into the negative range.
Step-by-Step Calculation
Following a step-by-step process ensures accuracy when performing calculations. This methodical approach is especially helpful when using a calculator.
In the given exercise, the steps are:
  • Step 1: Turn on the calculator
  • Step 2: Type in the first number (302)
  • Step 3: Choose the addition operation ('+')
  • Step 4: Enter the second number (-422)
  • Step 5: Press '=' to get the result
By following each step carefully, you ensure the correct numbers and operations are inputted, leading to the accurate sum of -120.

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