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

The video tutorial explains how to calculate 28% of 650 without using a calculator, a skill necessary for key stage two exams. It begins by finding 10% and 1% of the number, then combines these to calculate 28%. The tutorial also covers multiplying decimals and offers alternative methods for solving the problem, emphasizing that multiple approaches can be valid. The final answer is 182, and the tutorial encourages understanding different methods to find the solution.

What is the first step in finding 10% of a number without a calculator?

• Divide the number by 5

• Add 10 to the number

• Knock off a zero from the number

• Multiply the number by 0.1

How do you calculate 1% of a number?

• Multiply the number by 0.01

• Move the decimal point one place to the left

• Divide the number by 100

• Subtract 1 from the number

What is the result of multiplying 6.5 by 8?

• 65

• 520

• 52

• 48

What is the final answer when calculating 28% of 650?

• 182

• 165

• 150

• 200

Which of the following is an alternative method to find 28% of a number?

• Find 25% and add 3%

• Find 20% and add 8%

• Find 15% and double it

• Find 30% and subtract 2%