NC6NS3 Lesson 7 Multiply Multi-Digit Decimals

Front

What is the process to multiply multi-digit decimals?

Back

1. Ignore the decimal points and multiply the numbers as if they were whole numbers. 2. Count the total number of decimal places in both numbers. 3. Place the decimal point in the product, so it has the same number of decimal places as the total counted.

Front

If a trail is 8.54 miles long and someone rides it 4 times, how do you calculate the total distance traveled?

Back

Multiply the length of the trail (8.54 miles) by the number of times ridden (4): 8.54 x 4 = 34.16 miles.

Front

How do you find the area of a rectangle?

Back

Area = length x width. For example, if a wall is 9.5 feet tall and 13.5 feet wide, the area is 9.5 x 13.5 = 128.25 square feet.

Front

What is the cost of apples if they are $0.88 per pound and you buy 3.4 pounds?

Back

Multiply the price per pound by the number of pounds: 0.88 x 3.4 = $2.99.

Front

How do you round a number to the nearest cent?

Back

Look at the third decimal place. If it's 5 or more, round up the second decimal place by one. If it's less than 5, keep the second decimal place the same.

Front

What is the total cost if you buy 3.4 pounds of chicken at $3.79 per pound?

Back

Multiply the price per pound by the number of pounds: 3.79 x 3.4 = $12.89.

Front

What is a decimal?

Back

A decimal is a fraction expressed in a special form. It uses a decimal point to separate the whole number from the fractional part.

Front

How do you convert a decimal to a fraction?

Back

Write the decimal as a fraction with the decimal number as the numerator and a power of 10 as the denominator. Simplify if possible.

Front

What is the importance of estimating in multiplication?

Back

Estimating helps to quickly check if an answer is reasonable and can simplify calculations.

Front

What is the difference between area and perimeter?

Back

Area measures the space inside a shape (length x width), while perimeter measures the distance around a shape (sum of all sides).