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 teacher 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 derived through subtraction, showcasing a time-saving technique.

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

• Add a zero to the number

• Remove a zero from the number

• Multiply the number by 10

• Divide the number by 10

How do you calculate 1% of a number using the quick method?

• Multiply the number by 0.1

• Divide the number by 100

• Remove two zeros from the number

• Take 1/10 of 10% of the number

What is the relationship between 10% and 1% in the quick method?

• 1% is 1/10 of 10%

• 1% is 10 times 10%

• 1% is equal to 10%

• 1% is 100 times 10%

How do you calculate 99% of a number using the quick method?

• Divide 100% by 1%

• Subtract 1% from 100%

• Add 1% to 100%

• Multiply 1% by 99

What is the final answer when calculating 99% of 200 using the quick method?

• 200

• 180

• 198

• 202