Add, Subtract, Multiply & Divide Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, 3.14 is a decimal.

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.

Tags

CCSS.5.NBT.B.7

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.

Tags

CCSS.5.NBT.B.7

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.

Tags

CCSS.6.NS.B.3

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 with whole numbers.

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

Front

What is the average weight of an object?

Back

The average weight is found by dividing the total weight by the number of objects. For example, if 5 balls weigh 1.8 pounds, the average weight is 1.8 ÷ 5 = 0.36 pounds.

Tags

CCSS.6.NS.B.3

Front

If Tim bikes 9.4 miles each day, how far does he bike in 3 days?

Back

To find the total distance, multiply the daily distance by the number of days: 9.4 miles/day × 3 days = 28.2 miles.

Tags

CCSS.6.NS.B.3

Front

How do you calculate the remaining money after a purchase?

Back

To find the remaining money, subtract the cost of the item from the total amount of money you have. For example, $78.22 - $29.99 = $48.23.

Tags

CCSS.6.NS.B.3

Front

What is the cost of buying multiple items at a unit price?

Back

To find the total cost, multiply the unit price by the quantity purchased. For example, if peaches cost $2.50 per pound and 3 pounds are bought, the total cost is $2.50 × 3 = $7.50.

Tags

CCSS.6.RP.A.3B

Front

How do you calculate earnings based on hourly wage?

Back

To calculate earnings, multiply the hourly wage by the number of hours worked. For example, if Jackie earns $8.95 per hour and works 7.5 hours, her earnings are $8.95 × 7.5 = $67.125.

Tags

CCSS.7.NS.A.3