KS2 Primary Maths Age 13-17 - Calculations: Subtracting Decimals - Explained

The video tutorial explains how to subtract 3.45 from 9 by aligning decimals and filling empty spaces with zeros. It emphasizes the importance of lining up units correctly and highlights common mistakes students make. The tutorial concludes with the final answer of 5.55, encouraging practice to avoid errors.

What is the first step in setting up the subtraction of 9 minus 3.45?

• Align the decimal points and fill in zeros.

• Subtract directly without aligning.

• Ignore the decimal points.

• Convert the numbers to fractions.

Why is it important to fill in empty spaces with zeros when subtracting decimals?

• To confuse the subtraction process.

• To make the numbers look bigger.

• To ensure proper alignment of digits.

• To make the subtraction easier.

What should you do if you cannot subtract a smaller digit from a larger one in decimal subtraction?

• Reverse the digits.

• Skip the subtraction.

• Borrow from the next higher place value.

• Add a zero to the smaller digit.

What is the final answer to the subtraction problem 9 minus 3.45?

• 5.00

• 5.45

• 5.55

• 6.00

What is a common mistake students make when subtracting decimals?

• Forgetting to align the decimal points.

• Multiplying the numbers.

• Using a calculator.

• Adding instead of subtracting.