Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a dot (decimal point) separating the whole number from the fractional part.

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 value of 2 - 0.43?

Back

1.57

Front

What is the value of 123.6 - 0.08?

Back

123.52

Front

What is the value of 2.98 + 5.3?

Back

8.28

Front

What is the value of 21 + 4.09?

Back

25.09

Front

What is the value of 80.93 - 68?

Back

12.93

Front

What does it mean to 'carry' in addition?

Back

Carrying is the process of moving a value from one column to the next when the sum exceeds the base value (like 10 in decimal addition).

Front

What is the importance of the decimal point?

Back

The decimal point separates the whole number part from the fractional part, indicating the value of digits to the right of it.