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

What is the sum of 1.70 and 4.65?

Back

The sum of 1.70 and 4.65 is 6.35.

Front

What is a subtraction equation?

Back

A subtraction equation is a mathematical statement that shows the difference between two numbers, expressed in the form 'a - b = c'.

Front

How do you subtract decimals?

Back

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

Front

What is the difference between 9.45 and 8.42?

Back

The difference between 9.45 and 8.42 is 1.03.

Front

What is the total cost of 1 microscope at $30.50 and 2 thermometers at $17.77 each?

Back

The total cost is $66.04.

Front

What does it mean to round a decimal?

Back

Rounding a decimal means adjusting the number to a nearby value that is simpler and easier to work with, often to a specified place value.

Front

What is the value of 0.5 in terms of fractions?

Back

0.5 is equivalent to 1/2.

Front

What is the importance of the decimal point?

Back

The decimal point separates the whole number part from the fractional part in a decimal number, indicating the value of each digit.