Multiplication Expanded Algorithm Concepts

The video tutorial teaches the multiplication expanded algorithm, a strategy for multiplying numbers by breaking them into place values. It demonstrates the process using the example of 45 times 8, explaining how to set up the algorithm, calculate the ones and tens places, and finally add the results to find the product.

What is the purpose of the multiplication expanded algorithm?

• To divide numbers

• To add numbers

• To multiply numbers using place values

• To subtract numbers

What is the first step in setting up the expanded algorithm?

• Writing numbers side by side

• Drawing a number line

• Using a calculator

• Lining up place values vertically

In the expanded algorithm, what does the '4' in 45 represent?

• 4 ones

• 40 tens

• 4 hundreds

• 40

Why do we line up place values in the expanded algorithm?

• To ensure correct addition

• To make it look neat

• To make it easier to subtract

• To use a calculator

What is the first multiplication step in the expanded algorithm?

• Ones place times ones place

• Tens place times tens place

• Tens place times ones place

• Ones place times tens place

What is the product of 8 times 5 in the expanded algorithm?

• 50

• 40

• 35

• 45

What is the next step after multiplying the ones place?

• Add the results

• Divide the results

• Multiply the tens place by the ones place

• Subtract the results

What is the value of the tens place in the number 45?

• 45

• 40

• 5

• 4

What is the result of multiplying 8 by 40?

• 320

• 400

• 240

• 280

What is the quick trick mentioned for multiplying by 40?

• Subtract 10

• Divide by 10

• Cross out the zero and multiply

• Add a zero at the end