I came across this one on my 1st GMATPrep test as the 3rd question in the test and I wasted almost 3 mins trying to figure out the damn question but finally I did and the key here is that the row+column=the number that is why it's called a addition table 8)
so 4+x = 1
y+4 = -5
z+4=m
now that you know how to approach this question I am sure you will be able to figure out the answer.
BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course
Redeem
Featured Course
Target Test Prep GMAT OnDemand
Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.
- 715+ score guarantee — highest in the industry (99th percentile)
- 52 chapters · 1,500+ lessons · 4,000+ practice questions
- 400 hours of video · 1,500+ instructor-led HD smartboard lessons
- 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
- 24/7 live support + weekly Zoom office hours with GMAT instructors
- TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
- 1,200+ flashcards + AI-powered study assistant & daily calendar
- OnDemand, LiveTeach & GMAT Bootcamp formats available
- Also: GRE, SAT Math & Executive Assessment courses
- MBA Admissions Consulting now available
- 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
- 200,000+ students served
- 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★
5.0
(559 reviews)
130-pt guarantee
$0 to start
then $127/mo
gmat prep addition table
Source: Beat The GMAT — Problem Solving |
Doh! Sadly I knew that but had to do it another time very slowly to not get screwed up...frustrating!! 
Here is the answer:
you have to find m+n
let find out m and n from the table
m=z+4
n=y+e
m+n = 4+z+y+e
from the table we know z+e=10
so m+n=4+10+y = 14+y
from the table y = -9 (as y+4=-5)
so m+n=5
you have to find m+n
let find out m and n from the table
m=z+4
n=y+e
m+n = 4+z+y+e
from the table we know z+e=10
so m+n=4+10+y = 14+y
from the table y = -9 (as y+4=-5)
so m+n=5
