Review: Add and Subtract Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal that represents 5/10.

Front

How do you add decimals?

Back

To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.

Front

How do you subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point and subtract as you would whole numbers, placing the decimal point in the difference directly below the other decimal points.

Front

What is the result of 94 - 4.8?

Back

89.2

Front

What is the result of 2 - 0.43?

Back

1.57

Front

What is the total of $22.50, $14.75, and $8.50?

Back

$45.75

Front

What is the result of 21 + 4.09?

Back

25.09

Front

How do you find the difference between two decimal numbers?

Back

To find the difference, subtract the smaller number from the larger number, ensuring the decimal points are aligned.

Front

If Ms. Hvozdik ran 12.3 miles and Ms. Chaney ran 4.9 miles, how much farther did Ms. Hvozdik run?

Back

7.4 miles

Front

What is the importance of aligning decimal points when adding or subtracting?

Back

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