KS2 Primary Maths Age 13-17 - Ratio, Proportion and Algebra: Percentage Problems - Explained

The video tutorial demonstrates a quick method to solve a math problem by calculating percentages. The instructor explains how to find 10% and 1% of a number and uses these calculations to determine 99% of the original number. The final answer is reached through a series of straightforward steps, emphasizing efficiency and time-saving techniques.

What is the quick method to find 10% of a number?

• Add a zero to the number

• Multiply the number by 10

• Divide the number by 10

• Remove one zero from the number

How do you calculate 1% of a number according to the teacher's method?

• Add 1% to the number

• Take 1/10 of 10% of the number

• Divide the number by 100

• Multiply the number by 0.1

What is the value of 1% of 200?

• 20

• 200

• 2

• 0.2

How does the teacher calculate 99% of a number?

• By multiplying 100% by 99

• By subtracting 1% from 100%

• By adding 1% to 100%

• By dividing 100% by 99

What is the final answer for 99% of 200?

• 200

• 198

• 2

• 199