How to Do Negative on A Calculator

How to Enter Negative Numbers

Most calculators have a dedicated negative button or use the subtraction key to indicate negative numbers. Here's how to enter them:

Step-by-Step Instructions

1. Press the number you want to make negative.
2. Press the ± button (or the subtraction key if your calculator doesn't have a ± button).
3. The number will now display with a negative sign.

For example, to enter -5:

1. Press the 5 key.
2. Press the ± button.
3. The display shows -5.

Calculator Operations with Negatives

Negative numbers behave differently in different operations. Here's what to expect:

Addition and Subtraction

When adding or subtracting negative numbers, remember these rules:

• Adding two negative numbers: -2 + (-3) = -5
• Subtracting a negative number: 5 - (-3) = 8

Multiplication and Division

When multiplying or dividing negative numbers:

• Negative × Negative = Positive: -2 × -3 = 6
• Negative ÷ Negative = Positive: -6 ÷ -2 = 3

Common Mistakes with Negative Numbers

Many people make these mistakes when working with negative numbers:

Sign Errors

Forgetting to change the sign when performing operations can lead to incorrect results. For example:

• Incorrect: 5 - 3 = -8 (forgot to change the sign)
• Correct: 5 - 3 = 2

Order of Operations

Not following the correct order of operations (PEMDAS/BODMAS) can lead to errors with negative numbers. For example:

• Incorrect: 5 + -3 × 2 = 1 (multiplied first)
• Correct: 5 + (-3 × 2) = -1 (parentheses first)

Practical Examples

Here are some real-world examples of negative numbers in calculations:

Banking

Negative numbers represent debits or withdrawals:

• Balance: $100 + (-$50) = $50
• Overdraft: $50 - $100 = -$50

Temperature

Negative numbers represent temperatures below freezing:

• Freezing point: 0°C
• Below freezing: -5°C

Elevation

Negative numbers represent depths below sea level:

• Sea level: 0 meters
• Below sea level: -100 meters