Expressions Unit 2 Review: Multiplying Multi-Digit Numbers

Front

What is multiplication?

Back

Multiplication is a mathematical operation that represents the repeated addition of a number. For example, 4 multiplied by 3 (4 x 3) means adding 4 three times (4 + 4 + 4 = 12).

Front

How do you multiply multi-digit numbers?

Back

To multiply multi-digit numbers, you can use the standard algorithm: multiply each digit of the bottom number by each digit of the top number, starting from the rightmost digit, and then add the results together.

Front

What is the product of 28 and 90?

Back

The product of 28 and 90 is 2,520.

Front

If a bus tour costs $52 per person, how do you find the total cost for a group?

Back

To find the total cost for a group, multiply the cost per person by the number of people. For example, $52 x 8 people = $416.

Front

What is the total volunteer hours if 241 boys and 302 girls each volunteer for 7 hours?

Back

Total volunteer hours = (241 + 302) x 7 = 3,801 hours.

Front

What does the equation 50 x 90 = (5 x 10) x ( _ x 10) represent?

Back

This equation shows how to break down multiplication into smaller parts. The blank represents 9, so 50 x 90 = (5 x 10) x (9 x 10).

Front

How do you calculate the total money made from selling books?

Back

To calculate the total money made, multiply the price of each book by the number of books sold. For example, $3 x 232 books = $696.

Front

What is the associative property of multiplication?

Back

The associative property states that the way in which numbers are grouped in multiplication does not change the product. For example, (2 x 3) x 4 = 2 x (3 x 4).

Front

What is the commutative property of multiplication?

Back

The commutative property states that changing the order of the numbers in multiplication does not change the product. For example, 4 x 5 = 5 x 4.

Front

What is a factor in multiplication?

Back

A factor is a number that is multiplied by another number to get a product. For example, in 6 x 4 = 24, both 6 and 4 are factors.