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

The video tutorial demonstrates how to perform multiplication without considering decimals initially. It starts with calculating 39 times 3, then extends to 39 times 30. The instructor explains how to adjust the result for decimal placement, ensuring the final answer is accurate. The lesson concludes with a verification step, comparing the result to an estimated value to confirm its correctness.

What is the result of multiplying 39 by 3?

• 117

• 27

• 39

• 111

How many digits should be after the decimal point in the final answer?

• None

• Two

• Three

• One

What is the final answer when multiplying 3.9 by 30?

• 120

• 117

• 130

• 111

What is the estimated result of multiplying 4 by 30?

• 110

• 130

• 140

• 120

Why does the teacher feel confident about the answer 117?

• Because it is exactly 117

• Because it is slightly below 120

• Because it is slightly above 120

• Because it is exactly 120