KS2 Primary Maths Age 13-17 - Calculations: Multiplying and Dividing with Decimals - Explained

The video tutorial explains how to multiply decimals, using 0.5 * 28 as an example. It begins by equating 0.5 to 1/2 and solving the multiplication to get 14. The tutorial then introduces a technique for multiplying decimals by first ignoring the decimal point, performing the multiplication, and then adjusting the decimal place in the result. This method is applied to solve 0.5 * 28, resulting in 14 or 14.0. The tutorial concludes with a brief mention of how to handle more complex multiplications, such as 3.5 * 28, using the same technique.

What is the result of multiplying 0.5 by 28?

• 15

• 12

• 13

• 14

How can 0.5 be expressed as a fraction?

• 1/4

• 1/2

• 1/3

• 1/5

When multiplying 28 by 5, what is the first step in the process?

• Divide the numbers

• Subtract the smaller number from the larger

• Multiply the numbers without considering the decimal

• Add the numbers directly

Why is it important to adjust for the decimal point in the final answer?

• To make the answer larger

• To match the number of decimal places in the original numbers

• To ensure the answer is a whole number

• To make the answer smaller

If you were to multiply 3.5 by 28, what would be the first step?

• Add 3.5 to 28

• Multiply 28 by 35 and adjust for the decimal

• Multiply 28 by 3.5 directly

• Convert 3.5 to a fraction