Understanding the Multiplication Algorithm

This video tutorial addresses the common problem of multiplying multi-digit numbers by introducing a song-based method. It explains the importance of understanding place value systems, which are based on powers of 10, and provides a step-by-step algorithm for solving multiplication problems. The tutorial includes examples to illustrate the process and explains the logic behind the algorithm, emphasizing the importance of carrying over digits correctly. By the end of the video, viewers should have a clear understanding of how to multiply multi-digit numbers using the described method.

What problem does the teacher address in the video?

• Subtracting multi-digit numbers

• Dividing multi-digit numbers

• Adding multi-digit numbers

• Multiplying multi-digit numbers

Tags

CCSS.4.NBT.A.2

What is the place value system based on?

• Powers of 10

• Powers of 100

• Powers of 5

• Powers of 2

Tags

CCSS.4.NBT.B.5

What is the first step in the multiplication algorithm?

• Subtract the numbers

• Add the numbers

• Line the numbers up vertically

• Multiply the numbers directly

Tags

CCSS.5.NBT.B.5

In the algorithm, what do you do after multiplying by the digit in the ones place?

• Carry any tens like papers in a briefcase

• Ignore the tens

• Subtract the tens

• Add a zero in the tens place

Tags

CCSS.6.NS.B.3

What is the purpose of adding zeros in the algorithm?

• To make the numbers look bigger

• To keep track of place values

• To confuse the students

• To make the process longer

Tags

CCSS.5.NBT.B.5

What is the example used to explain the algorithm?

• 100 times 10

• 86 times 54

• 12 times 11

• 47 times 29

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Why is it important to cross out digits that you carry?

• To save space

• To make the process faster

• To avoid confusion in the next steps

• To make the paper look neat

Tags

CCSS.3.OA.B.5

What is 12 times 11 broken down into?

• 12 times 3 plus 12 times 8

• 12 times 2 plus 12 times 9

• 12 times 10 plus 12 times 1

• 12 times 5 plus 12 times 6

Tags

CCSS.4.NBT.B.5

How is 47 times 29 broken down in the explanation?

• 47 times 20 plus 47 times 9

• 47 times 15 plus 47 times 14

• 47 times 5 plus 47 times 24

• 47 times 10 plus 47 times 19

Tags

CCSS.4.NBT.B.5

What is the key concept behind the multiplication algorithm?

• Adding numbers

• Understanding place value

• Subtracting numbers

• Dividing numbers

Tags

CCSS.4.NBT.B.5