Module 4: Operations with Decimals

Front

What is a decimal?

Back

A decimal is a fraction expressed in a special form. It represents a part of a whole number, using a decimal point to separate 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 0.5 feet in inches?

Back

0.5 feet is equal to 6 inches (1 foot = 12 inches).

Front

How do you multiply decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both numbers and place the decimal point in the product accordingly.

Front

How do you divide decimals?

Back

To divide decimals, move the decimal point in the divisor to the right until it is a whole number, and move the decimal point in the dividend the same number of places. Then divide as you would whole numbers.

Front

What is the formula to calculate distance?

Back

Distance = Speed × Time.

Front

If a door is 11.5 inches long, how long are the large cabinet doors that are 2.3 times longer?

Back

The large cabinet doors are 26.45 inches long (11.5 inches × 2.3).

Front

How do you calculate the total cost of multiple items?

Back

Total Cost = Number of Items × Cost per Item.

Front

If Marta walked at 3.9 miles per hour for 0.72 hours, how far did she walk?

Back

Marta walked 2.808 miles (3.9 miles/hour × 0.72 hours).