Multiplication and Decimal Concepts

The video tutorial explains how to multiply decimals using the partial products method. It begins with making a magnitude estimate to determine the placement of the decimal point in the final answer. The tutorial demonstrates solving two problems: one with smaller numbers and another with larger numbers. The process involves removing the decimal, expanding numbers, creating a box for multiplication, and then adding the results. The video emphasizes the importance of magnitude estimates in determining the correct placement of the decimal point in the final answer.

What method is being used to teach multiplication with decimals?

• Long division method

• Partial products method

• Cross multiplication method

• Direct multiplication method

What is the first step in solving 1.2 * 5 using the partial products method?

• Subtract the numbers

• Estimate the magnitude

• Multiply directly

• Add the numbers

How do you handle the decimal in the problem 1.2 * 5?

• Remove it temporarily

• Ignore it completely

• Double it

• Move it to the end

What is the expanded notation for the number 12?

• 20 + 1

• 1 + 11

• 12 + 0

• 10 + 2

Where should the decimal point be placed in the answer for 1.2 * 5?

• In the tenths place

• In the ones place

• In the hundreds place

• In the tens place

What is the first step in solving 42.6 * 3.9?

• Estimate the magnitude

• Multiply directly

• Add the numbers

• Subtract the numbers

What is the magnitude estimate for 42.6 * 3.9?

• 130

• 140

• 160

• 150

What is the expanded notation for 426?

• 40 + 26

• 420 + 6

• 400 + 26

• 400 + 20 + 6

What is the final answer for 42.6 * 3.9 after placing the decimal?

• 166.14

• 166.4

• 166.04

• 166.40