MiniMaths - Upper & Lower Bounds (Challenge)| GCSE Maths Revision

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In this video I tell you how to find the upper and lower bounds in a more challenging question that uses an equation for speed, requiring that you find the maximum and minimum possible outcomes. AND THERE IS AN ERROR IN THE QUESTION! It should read 'to the nearest 60s' not 30s. So sorry about this, great catch by a commenter.

Thanks for watching, I hope it helped and let me know in the comments if you want me to explain anything!

Jolene Moon is a private tutor with hundreds of hours of experience teaching students ranging from children to adult learners, and is currently writing their thesis on uranium corrosion for their PhD in Physics.

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Why is the lower bound of 80 seconds 840
I thought i was supposed to divide the degree of accuracy being 30 seconds by 2
And when that gives me 15 i subtract and that's 870 minus 15 which is 855
I'm so confused rn 😢
But this was quite helpful

Kamsi-fsbd