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

The video tutorial explains how to perform long multiplication using the example of 4781 multiplied by 23. The process is divided into two parts: first multiplying by 3 and then by 20 (two tens). The instructor emphasizes the importance of placing digits correctly and adding the results. The final answer is calculated, and the concept of method marks is discussed, highlighting that students can earn marks for correct methods even if the final answer is incorrect due to arithmetic errors.

What is the result of multiplying 1 by 3 in the first step of the multiplication process?

• 3

• 6

• 1

• 4

When multiplying by 20, why is it important to place a zero in the unit column?

• To make the calculation easier

• To align the numbers correctly

• To account for the tens place

• To avoid arithmetic mistakes

What is the sum of 4 and 5 in the addition step of the final calculation?

• 11

• 9

• 8

• 10

What is the final answer obtained after adding the results of the two multiplications?

• 109963

• 1099631

• 1099630

• 1099632

What is the consequence of forgetting to place a zero when multiplying by 20?

• It results in a wrong final answer

• It is considered an arithmetic mistake

• It leads to a method mark deduction

• It is not considered an arithmetic mistake