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 x 3 means adding 4 three times (4 + 4 + 4).

Front

What is a multi-digit number?

Back

A multi-digit number is a number that has two or more digits. For example, 145 and 81 are multi-digit numbers.

Front

How do you multiply a multi-digit number by a single-digit number?

Back

To multiply a multi-digit number by a single-digit number, multiply each digit of the multi-digit number by the single-digit number, starting from the rightmost digit.

Front

What is the product of 145 and 8?

Back

1,160

Front

How do you estimate the product of two numbers?

Back

To estimate the product, round each number to the nearest ten or hundred and then multiply the rounded numbers.

Front

What is the area model in multiplication?

Back

The area model is a visual way to represent multiplication by breaking numbers into parts. For example, to multiply 72 by 13, you can break 72 into 70 and 2, and 13 into 10 and 3.

Front

What is the distributive property?

Back

The distributive property states that a(b + c) = ab + ac. It allows you to multiply a number by a sum by distributing the multiplication.

Front

What is the product of 81 and 30?

Back

2,430

Front

How do you check your multiplication answer?

Back

You can check your multiplication answer by using the inverse operation, which is division. Divide the product by one of the factors to see if you get the other factor.

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.