KS2 Primary Maths Age 13-17 - Ratio, Proportion and Algebra: Formulas and Expressions - Explained

The video tutorial explains how to solve a math problem where Lara chooses a number less than 20, divides it by two, adds six, and then divides the result by three to get 4.5. The teacher demonstrates how to reverse these operations to find the original number, emphasizing the importance of understanding each step and using math tables. The solution involves multiplying, subtracting, and multiplying again to arrive at the final answer of 15.

What is the first step Lara takes with her chosen number?

• She divides it by two.

• She adds six.

• She subtracts six.

• She multiplies it by three.

What is the final result after Lara performs all her operations?

• 3.5

• 4.5

• 5.5

• 6.5

What is the first operation to reverse the process starting from 4.5?

• Subtract six

• Multiply by two

• Divide by three

• Multiply by three

After multiplying 4.5 by three, what is the next step?

• Add six

• Divide by two

• Subtract six

• Multiply by two

What is the original number Lara started with?

• 12

• 18

• 15

• 10