Mastering Adding and Subtracting Decimals with Negatives

This video tutorial covers the process of adding and subtracting decimals, including examples with negative numbers. It emphasizes the importance of aligning decimals and converting subtraction problems into addition by using the opposite sign. The video provides step-by-step solutions to several problems, demonstrating how to handle positive and negative numbers and determine the sign of the final answer.

What is the first step in adding or subtracting decimals?

• Line up the decimals

• Add the numbers

• Ignore the signs

• Subtract the numbers

What is the result of negative four point six plus two point three?

• 6.9

• 2.3

• -2.3

• -6.9

When adding numbers with different signs, what determines the sign of the result?

• The number with the larger absolute value

• The operation performed

• The last number in the equation

• The first number in the equation

When adding a negative and a positive number, what operation do you actually perform?

• Multiplication

• Division

• Addition

• Subtraction

What is the result of negative eight point two minus negative one point nine?

• -6.3

• 6.3

• -10.1

• 10.1

How do you handle subtracting a negative number from another negative number?

• Change to addition and add the opposite

• Just subtract the numbers

• Multiply the two numbers

• None of the above

What is the result of four point seven plus one point three four five?

• 6.045

• 5.955

• 3.355

• 2.345

In the operation of negative ten point two four plus twelve point one two three, what is the first step?

• Convert to addition

• Line up the decimals

• Add the numbers

• Subtract the numbers

What is the final result of negative ten point two four plus twelve point one two three?

• -2.879

• -1.883

• 1.883

• 2.879

When subtracting a smaller number from a larger number with mixed signs, what is crucial?

• Ignoring the decimal points

• Changing all numbers to positive

• Keeping the original signs

• Lining up the decimal points