How to use upper and lower bounds

How to use upper and lower bounds.

This video is around grade A GCSE and deals with the question:
"Sarah uses the formula Speed = Distance / Time to work out the average speed for a marathon.

The distance is 26.2 miles correct to 3 significant figures. The time is 3.1 hours correct to 1 decimal place.

Calculate the least possible value for Sarah's average speed. Give your answer correct to 2 decimal places."

I hope this video helps and please do leave a comment - thanks!

[fariamahmud]

Thank you so much Simon.I desperately needed a bound tutorial.Now I hope to beat some of these maths problems tomorrow at my O'level exam.(this tutorial just saved four marks for tomorrow!) You are awesome. :)

[jackshanahan]

lol that last 'forever alone moment when he smiles at the camera, expecting someone to turn it off. then he has to go and do it himself.

[tweed_guy]

Thanks Simon I missed the upper and lower bounds lesson and my teacher gave us homework on it and I didn't understand a thing and thanks to you I can finally do it

[Aspeexia]

I have my maths GCSE tomorrow thanks for this last minute revision! :)

[YomanExpert]

Thanks so much Simon Deacon! I had so much problems with this...as my teacher didn't explain the topic properly...but because of your tutorial...im able to understand without any difficulties!

[abbiecoppell]

This video really helped me understand LB and UB a lot better! Thank you :)

[HarmanKakel]

Thanks man! All your videos are helping me a lot for my maths exams

[SuperSonicSpeedGuy]

Thanks for the video's, they're really helpful! We've gone over this time and time again in class but I just couldn't understand it, but know I do :-) Exams are fast approaching (Just one week!), so please keep up the good work on these fantastic vids! Thanks again, Ry.

[muazsaqib]

Uncle Simon u r the best Teacher :) i like the way u explained everything ..

[AIONBERSERKER]

Thanks for the video for all those out there an easy way to remember this is with the following definition:

Whenever a measurement is rounded to a given unit, the actual measurement can be anything up to HALF a unit bigger or smaller.

[JexMonsta]

So i have been watching u for about a week now with my revision and i found ur videos very helpful with simple explanations thnx

[imanazam]

thx this helped loads. I was struggling.

[dawn]

Thanks as an adult learner this has cleared up a few questions on this subject. Going to tell all my classmates about this .

[amavprasee]

Thanks, that was helpful. Try making videos on calculating area and perimeter through bounds.

[glimmerlifeVA]

Hi, I recently moved to a new school which isn't a special needs one, and as I have a little learning difficulties I'm finding the maths lessons really hard to grasp. I recently failed  on my first maths exam.  I kinda get the concept a bit with UB and LB- but my teacher asks for 1 significant figures instead of many, she also says you have to show the steps or you won't get your marks but  I've only JUST grasped the idea of how to work out set theory. I have tutoring four times a week and self- study but because my old school gave us work meant for 5 graders in year 9... well, I couldn't really grasp THAT. please do you have any advice for me?  -I'm a 10th grader and I'm really nervous because I NEED maths in the future when I am to qualify for Collage.
-Please reply if you can
Thanks for your time

[mollycooper]

Thankyou really been struggling but this really helped

[eesaarashid]

This helped a lot my maths teacher can't even tech us this when questions we approach are these

[franklynd]

Thanks this video helped so much it's like right before my IGCSE exam and I'm totally comfused after I've seen this video I got the questions right. Thumb up sir.

[yusrmalik]

hey Simon Deacon your video actually helped me in getting the concept of the upper and lower bounds! i got the part that i divide 0.1 by two and then subtract it from and add it to the time to get the lower bound and the upper bound of the time but what i didnt really get is the part of the three significant figures
do we divide 0.1 by two and subtract it from and add it to the distance?
i am having a test tmw  and i would really like it if you would reply asap
THANK YOU AGAIN!!!

[whitts]

another brilliant tutorial, these really help thanks simon