Adding and Subtracting Decimals with Models

Front

What is the process of adding decimals?

Back

To add decimals, align the numbers by their decimal points and add each column starting from the right, carrying over if necessary.

Front

What is the process of subtracting decimals?

Back

To subtract decimals, align the numbers by their decimal points and subtract each column starting from the right, borrowing if necessary.

Front

How do you represent a decimal in a place value block?

Back

A decimal in a place value block is represented by the shaded parts corresponding to the value of each block, such as tenths, hundredths, etc.

Front

What is the sum of 12.34 and 9.56?

Back

The sum of 12.34 and 9.56 is 21.90.

Front

What is the difference between 9.43 and 3.34?

Back

The difference between 9.43 and 3.34 is 6.09.

Front

How do you round a decimal to the nearest tenth?

Back

To round a decimal to the nearest tenth, look at the hundredths place; if it is 5 or greater, round up the tenths place by one.

Front

What is the value of 0.32 + 0.17?

Back

The value of 0.32 + 0.17 is 0.49.

Front

What does the decimal 0.9 represent in terms of place value?

Back

The decimal 0.9 represents 9 tenths.

Front

How can models help in understanding addition and subtraction of decimals?

Back

Models visually represent the values of decimals, making it easier to see how they combine or separate.

Front

What is the importance of aligning decimal points when performing operations?

Back

Aligning decimal points ensures that each digit is in the correct place value, which is crucial for accurate addition or subtraction.