Adding and Subtracting Decimals Pre-test

Front

What is the process of adding decimals?

Back

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

Front

How do you subtract decimals?

Back

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

Front

What is the sum of 10.9, 8.6, and 12.4?

Back

31.9 hours.

Front

What is 13.16 + 5.90?

Back

19.06.

Front

What is 5.72 - 3.55?

Back

2.17.

Front

How do you find the difference between a predicted and actual value?

Back

Subtract the actual value from the predicted value.

Front

What is the difference between 1.254'' and .875''?

Back

.379''.

Front

Why is it important to align decimal points when performing addition or subtraction?

Back

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

Front

What is a common mistake when adding or subtracting decimals?

Back

A common mistake is misaligning the decimal points, which can lead to incorrect sums or differences.

Front

What is the significance of carrying over in decimal addition?

Back

Carrying over is necessary when the sum of a column exceeds 9, ensuring that the next column is correctly adjusted.