Lesson: QC Strategy - Approximation

Reinforcement Activities

Comment on QC Strategy - Approximation

chinna - November 18, 2016
3003/9009=1/3 then 3003/9047 should be more then 1/3 how it is less than 1/3
greenlight-admin's picture

greenlight-admin - November 18, 2016

To show why making the denominator bigger makes the value of the fraction smaller, consider this extreme example with a super huge denominator:
3003/300300000000
This fraction simplifies to 1/100000000, which is MUCH smaller than 1/3.

For more on this strategy see https://www.greenlighttestprep.com/module/gre-arithmetic/video/1067 (the related concept starts at 3:00)

ketan001 - May 1, 2019
Thanks for this!

Yvette Samaha - November 25, 2016
I am enjoying learning your tricks... I am planning on barely using the calculator if not at all... Thank you..
tahmina.mm's picture

tahmina.mm - December 3, 2016
your tricks are just amazing.

Hashimalizain - December 17, 2016
very helpful tips and tricks..makes life so easy...thank you so much

Tanvir_Khan - December 20, 2017
Learned something new today! thanks
greenlight-admin's picture

greenlight-admin - December 20, 2017

Glad you liked the lesson!

Cheers,
Brent

Reetika Chaturvedi - September 20, 2018
Hello sir,
I am really finding your videos useful but I am not getting how to access all the questions related to one particular topic.Kindly guide me.
greenlight-admin's picture

greenlight-admin - September 21, 2018

Under most video lessons (like the video above), have a Reinforcement Activities box (like the one above) with links to practice questions related to the concepts covered in the video lesson.

Here's a better example: https://www.greenlighttestprep.com/module/gre-arithmetic/video/1071

Does that help?

Cheers,
Brent

wirelessfella - November 11, 2018
Brilliant! I am very pleased that I found...I need to kick ass on this exam
greenlight-admin's picture

greenlight-admin - November 11, 2018

Glad you like it

Cheers,
Brent

Angel - February 23, 2019
Very educative, please I want find out how 2006/5987 is greater than 1/3
greenlight-admin's picture

greenlight-admin - February 23, 2019

We know that 2006/6018 = 1/3
So, 2006/5987 must be GREATER THAN 1/3

For more on this strategy, watch https://www.greenlighttestprep.com/module/gre-arithmetic/video/1067 (starting at 2:57)

Cheers,
Brent

Anil Banstola - July 23, 2019
I could find only one question in reinforcement practice first bullet. Please help, what I did wrong?
greenlight-admin's picture

greenlight-admin - July 23, 2019

Sorry, but I'm not sure I understand your question.
Can you please rephrase it?

Karenn@1355 - October 11, 2019
what is the reason when using Reinforcement Activities practices, the practice is not highlighted any more and I couldn't use that link for second time!!
greenlight-admin's picture

greenlight-admin - October 12, 2019

Once you visit a linked practice question, the link appears lighter so that you know which questions you've already answered.
That said, you should be able to use the link as many times as you wish.
I just checked, and I can do that.

What happens when you click a link a second time?

Karenn@1355 - October 13, 2019
Thanks I got it.

pd187540 - April 26, 2020
Whenever I see big numbers that you need to multiply and the calculator can't compute them (i.e. says "error"), I just use smaller numbers. For example, in the last QC question, side A is 131,047 X 480,111. I break those down into more manageable "tasty" numbers that the calculator can compute. I call this the "Feed the Calculator" technique. Give it some tasty numbers that it will find utterly delectable. (You like that witty technique? I do! Nobody has come up with it except myself!) So I would convert those numbers to 131.05 and 480.1. 131 and 480.1 are ok too. Do the same for side B and you will still get answer A.
greenlight-admin's picture

greenlight-admin - April 26, 2020

Great idea!!

arafatr - June 21, 2020
I liked the "bigger than" notation concept,
greenlight-admin's picture

greenlight-admin - June 22, 2020

I'm glad you like it!

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