Adding and Subtracting with 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 importance of lining up decimal points?

Back

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

Front

What is a space holder in decimal addition?

Back

A space holder is a zero used to fill in empty places in a decimal number to ensure proper alignment when adding or subtracting.

Front

Calculate: 45.5 - 13.5

Back

31.0

Front

Calculate: 0.5 + 1.2

Back

1.7

Front

True or False: You must stack the numbers vertically when adding or subtracting decimals.

Back

True

Front

What does it mean to stack a problem correctly?

Back

Stacking a problem correctly means aligning the numbers by their decimal points and ensuring that each digit is in the correct column.

Front

Example of a correctly stacked addition problem: 2.75 + 1.25 What is the sum?

Back

The sum is 4.00.