Lesson: QC Strategy - Approximation

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

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)

I am enjoying learning your tricks... I am planning on barely using the calculator if not at all... Thank you..
tahmina.mm's picture

your tricks are just amazing.

very helpful tips and tricks..makes life so easy...thank you so much

In your modulus of multiplying doubles and halves what if we get the number 75X84 what to do in such a case
greenlight-admin's picture

These are pretty big numbers, so some students may feel more comfortable using the onscreen calculator.

That said, here's how I would calculate that product in my head:

75 x 84 = 150 x 42
= 300 x 21
= 300(20 + 1)
= (300 x 20) + (300 x 1)
= 6000 + 300
= 6300

Learned something new today! thanks
greenlight-admin's picture

Glad you liked the lesson!

Cheers,
Brent

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

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

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

Glad you like it

Cheers,
Brent

greenlight-admin's picture

Glad you like it

Cheers,
Brent

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