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# M23-13

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Math Expert
Joined: 02 Sep 2009
Posts: 94605
Own Kudos [?]: 643487 [15]
Given Kudos: 86734
Math Expert
Joined: 02 Sep 2009
Posts: 94605
Own Kudos [?]: 643487 [1]
Given Kudos: 86734
Current Student
Joined: 06 Jul 2019
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Location: India
Concentration: General Management, Strategy
GMAT 1: 640 Q39 V39
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GPA: 3.11
WE:Project Management (Computer Software)
Math Expert
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I have edited the question and the solution by adding more details to enhance its clarity. I hope it is now easier to understand.
Intern
Joined: 03 May 2023
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Location: Indonesia
Schools: Sloan '26
GRE 1: Q166 V163
GPA: 3.01
Hi Bunuel

Can you refer me to more resources about these kinds of questions? I.e those about getting the tens/hundreds/thousands digit given a subtraction/addition
Are there more "formal"/elegant/algebraic ways to solve them, or is it purely making smart guesses on what number will prove/disprove the statements?
Math Expert
Joined: 02 Sep 2009
Posts: 94605
Own Kudos [?]: 643487 [0]
Given Kudos: 86734
r_putra_rp wrote:
Hi Bunuel

Can you refer me to more resources about these kinds of questions? I.e those about getting the tens/hundreds/thousands digit given a subtraction/addition
Are there more "formal"/elegant/algebraic ways to solve them, or is it purely making smart guesses on what number will prove/disprove the statements?

Check Arithmetic's tag in DS: https://gmatclub.com/forum/search.php?s ... &tag_id=30
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