KS2 Primary Maths Age 13-17 - Calculations: Written Multiplication - Explained

The video tutorial explains how to multiply 100 by 412 by rearranging the equation to 412 * 100. It demonstrates the calculation of 412 * 1 and then adjusts for multiplying by 100, resulting in the final answer of 41200. The tutorial concludes with the marking scheme for the question.

What is the initial multiplication problem presented in the video?

• 100 * 4

• 10 * 412

• 100 * 412

• 412 * 10

How is the multiplication problem rearranged for easier calculation?

• 412 * 10

• 100 * 412

• 10 * 100

• 412 * 100

What is the result of multiplying 412 by 1?

• 4120

• 41200

• 412

• 41.2

What adjustment is made after multiplying 412 by 1 to account for multiplying by 100?

• Divide by 10

• Add two zeros at the end

• Multiply by 10

• Subtract two zeros

What is the final answer to the multiplication problem?

• 41000

• 41200

• 412

• 4120