Mastering 2-Digit by 1-Digit Multiplication

This video tutorial reviews how to perform two-digit by one-digit multiplication. It begins with aligning numbers by place value, then multiplying digits in the ones place, regrouping if necessary, and finally multiplying the tens digit. An alternative method using partial products is also demonstrated. The video includes examples of multiplying 34 by 6 and 18 by 9, offering different strategies to solve these problems.

Why is it important to line up the numbers with the ones place when multiplying?

• To avoid making mistakes in addition

• To make the problem easier to read

• To ensure the correct digits are multiplied

• To make the numbers look neat

What is the first step in multiplying two-digit by one-digit numbers?

• Add the digits together

• Multiply the tens place digits

• Subtract the digits

• Multiply the digits in the ones place

What should you do if the product of the ones place digits is greater than 9?

• Subtract 10 from the product

• Ignore the tens digit

• Regroup the tens digit to the tens place

• Write the entire product in the ones place

After multiplying the tens digit by the bottom number, what is the next step?

• Multiply the result by 10

• Add the regrouped number

• Divide the result by 2

• Subtract the regrouped number

What is the product of 3 times 6 in the example given?

• 12

• 18

• 24

• 30

In the partial products method, how is the number 18 broken down?

• 9 + 9

• 12 + 6

• 10 + 8

• 15 + 3

What is the product of 10 times 9 in the partial products method?

• 90

• 81

• 91

• 80

What is the final step in the partial products method?

• Divide the partial products

• Add the partial products

• Multiply the partial products

• Subtract the partial products

In the example problem, what is the product of 8 times 9?

• 63

• 72

• 90

• 81

What is the final answer for the example problem 18 times 9?

• 152

• 182

• 162

• 172