Adding and Subtracting with Decimals in Real-Life Scenarios

The video tutorial covers adding and subtracting whole numbers and decimals, focusing on problems involving money. It explains the importance of lining up decimals and provides step-by-step strategies for performing these operations. Examples using grids illustrate the concepts, and a word problem demonstrates calculating change. The tutorial concludes with a summary of the key points.

Why is money often used in problems involving decimals?

• Because it is always in whole numbers

• Because it is a common real-life example

• Because it is easy to calculate

• Because it has a decimal point

What is the first step when adding or subtracting decimals?

• Add the numbers

• Subtract the numbers

• Line up the decimals

• Bring down the decimal

What should you do after lining up the decimals?

• Add the numbers

• Subtract the numbers

• Bring down the decimal

• Check your work

In the example of adding 0.3 and 0.9, what is the final answer?

• 1.3

• 1.1

• 1.2

• 1.4

How many tenths are highlighted in 0.3?

• 3

• 9

• 10

• 30

In the example of subtracting 0.63 from 1.78, how many hundredths are left?

• 0.125

• 0.105

• 0.115

• 0.15

What is the first step in solving a word problem involving decimals?

• Analyze the problem

• Plan the solution

• Solve the problem

• Check the answer

How much change does Devon get back if her lunch costs $3.65 and she pays with a $10 bill?

• $6.55

• $6.35

• $6.45

• $6.25

What should you do to ensure your subtraction is correct?

• Ask someone to check

• Subtract again

• Add the middle number and the answer

• Re-do the subtraction

What is the final step in the problem-solving model?

• Plan the solution

• Evaluate and justify the answer

• Analyze the problem

• Solve the problem