GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Percentage - Explained

The video tutorial explains how to calculate percentages without a calculator by first determining 10% of a number and then using that to find other percentages, such as 60%. The example given is calculating 60% of 70 by first finding 10% (which is 7) and then multiplying it by 6 to get 42. The tutorial also discusses the marks allocation for such a question, emphasizing the importance of understanding the process of finding 10% first.

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