Mastering Decimal Addition and Subtraction

Tiffany demonstrates how to add and subtract decimals by aligning numbers by their decimal points. She provides six examples, illustrating the use of placeholders and borrowing in subtraction. The video emphasizes the importance of aligning decimals to ensure accurate calculations.

What is the first step in adding or subtracting decimals?

• Start adding from the right

• Subtract the smaller number from the larger

• Add zeros as placeholders

• Align the decimal points

In example one, what is the sum of 1.2 and 0.6?

• 0.18

• 2.0

• 1.8

• 1.6

Why do we add a zero as a placeholder in decimal operations?

• To increase the value

• To align the decimal points

• To ensure correct place value alignment

• To make subtraction easier

What is the result of adding 5.21 and 3.025?

• 8.215

• 8.25

• 8.235

• 8.325

How do you handle adding decimals with more than one missing place?

• Ignore the missing places

• Add zeros to the end of the number

• Only add zeros to the beginning

• Fill in zeros for all missing places

What is the sum of 24.07 and 0.175?

• 24.75

• 24.0075

• 24.245

• 24.875

What is the first step in subtracting decimals?

• Align the decimal points

• Subtract the whole numbers first

• Convert to fractions

• Add zeros as placeholders

What is the result of subtracting 1.54 from 8.99?

• 7.55

• 7.54

• 7.45

• 7.445

How do you handle subtraction when you need to borrow across the decimal?

• Change the decimal to a 9

• Subtract an additional one from the minuend

• Borrow from the next highest place value

• Ignore the decimal

What is the result of subtracting 0.26 from 9.05?

• 8.79

• 8.85

• 8.99

• 5.24