International Maths Olympiad Forum By SOF Olympiad Trainer - Page 753
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Aarna Gupta from DPS EAST, BANGALORE , Bengaluru
Subject :IMO    Class : Class 1

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is C.

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Avaneesh Sai Vemparala from The knowledge habitat, Pune
Subject :IMO    Class : Class 6

Ans 1:

Adithya Vardhan from Loyola School, Trivandrum
Class : Class 9
answer is option c

Ans 2:

Ira Anand from Learning Tree, Chennai
Class : Class 7
I dont see how option C is the correct option

Ans 3:

Subharsish Kashyap from Carmel school, Jorhat
Class : Class 8
how is the answer C ?

Ans 4:

VYOM VIVEK PATEL from Doon Public School Bhuj, Bhuj Kuchchh
Class : Class 9
please xplain this question

Ans 5:

Avaneesh Sai Vemparala from The knowledge habitat, Pune
Class : Class 3

Ans 6:

Shreya Shruti from Airforce school , Bengaluru
Class : Class 9
Very complicated answer shown

Ans 7:

Avaneesh Sai Vemparala from The knowledge habitat, Pune
Class : Class 3

Ans 8:

Karthik Reddy Munnangi from Chirec International School, Hyderabad
Class : Class 9
I think the answer should be B

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Kavin Karthick M from DPS bangalore east, Bengaluru
Subject :IMO    Class : Class 3

Ans 1:

Varesh Hemwani from R.D Public School Betul, betul
Class : Class 3
it is 18 and 8

Ans 2:

Kavin Karthick M from DPS bangalore east, Bengaluru
Class : Class 6
SHOULD BE 18?

Ans 3:

Rajveer from DPS, Bengaluru
Class : Class 3
a

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Nishant Doshi from new era senior secondary school nizampura vadodara, Vadodara
Subject :IMO    Class : Class 5

Ans 1:

Vihaan Tyagi from Vikas the concept, Hyderabad
Class : Class 10
incomplete q

Ans 2:

Devesh Kumar Shrivastava from Ramjas School, Pusa Road, New Delhi
Class : Class 10
Incomplete question

Ans 3:

Tanmay Chaudhary from MIET public school, MEERUT
Class : Class 7
I AGREE WITH YOU GUYS

Ans 4:

ANUSHKA DUBEY from PODAR INTERNATIONAL SCHOOL, AHMEDABAD
Class : Class 8
incomplete question with no solution

Ans 5:

Sutirth Badu from Sherwood High, Bengaluru
Class : Class 8
Incomplete question .this had never happened before:(

Ans 6:

Parth from Dlf public school, Sahibabad
Class : Class 6
this question is wrong because you have only given the cost of the first hour

Ans 7:

Mystic Girl from NPS, Bnagalore
Class : Class 6
incomplete

Ans 8:

ROHIT KUMAR from DPS , SURAT
Class : Class 7
incomplete question

Ans 9:

Harsh Kumar from Maharishi Vidya Mandir, Guwahati
Class : Class 8
incomplete question, no solution

Ans 10:

Tanmay Chaudhary from MIET public school, MEERUT
Class : Class 7
SOF IS THE WORST

Ans 11:

PRANSHU MOHANTY from INDIRA GANDHI MEMORIAL HIGH SCHOOL, KOLKATA
Class : Class 5
Incomplete que

Ans 12:

Vishal B from National Public School, Chennai
Class : Class 10

Ans 13:

AASTHA RAI from AUXILIUM SCHOOL, KOLKATA
Class : Class 6
incompete question

Ans 14:

Sahil Sabne from Gurukul, Pune
Class : Class 7

Ans 15:

Syed Mohammad Hussain from ISAM, Muscat
Class : Class 8

Ans 16:

Krethick Ravichandran from FIITJEE GLOBAL SCHOOL , India
Class : Class 9

Ans 17:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 18:

AASTHA RAI from AUXILIUM SCHOOL, KOLKATA
Class : Class 6
Incomplete question.

Ans 19:

navya from dps, noida
Class : Class 6

Ans 20:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar
Class : Class 4
incomplete question

Ans 21:

Daksh from RKC, Rajkot
Class : Class 8
I am speechless

Ans 22:

Tejas Agarwal from Prudence School , New Delhi
Class : Class 10
question is completed in pdf

Ans 23:

prajnya from chrysalis, Bangalore
Class : Class 5
incomplete question .can not find the answer

Ans 24:

AARAV AGRAWAL from Christ Church School for Boys and Girls ISC, Jabalpur
Class : Class 9
Incomplete Question.

Ans 25:

Sarang Shete from Amanora School, Pune
Class : Class 8
Wrong question. I expected more accurate question.

Ans 26:

Syed Mohammad Hussain from ISAM, Muscat
Class : Class 8
SOF you are the worst olympiad trainer

Ans 27:

NYRAH GUPTA from Sat Paul Mittal School, Ludhiana
Class : Class 7

Ans 28:

M Harshith Sai from Kishore ratnam, Nellore
Class : Class 5

Ans 29:

Daksh from RKC, Rajkot
Class : Class 8

Ans 30:

Aayushman mohapatra from Sentia the global school, hyderabad
Class : Class 9
This is an incomelete question!!!!!!!!!!!!

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Nandakumar from Velammal bodhi campus, Chennai
Subject :IMO    Class : Class 5

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PRANEEL PRIYASH PANDA from AECS NARORA, BULANDSHAHR
Subject :IMO    Class : Class 6

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PRANEEL PRIYASH PANDA from AECS NARORA, BULANDSHAHR
Subject :IMO    Class : Class 6

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Pranav Arun from garib school, Mumbai
Subject :IMO    Class : Class 6

Ans 1:

Suhani sharma from Delhi public school, Chandigarh
Class : Class 6
Ans c only makes sense

Ans 2:

DEVAANGANA SARDAR from G.D. Birla Centre for Education, Kolkata
Class : Class 7
Remember LEFT TO RIGHT

Ans 3:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
Answer should be C

Ans 4:

Priyam Bhattacharya from cambridge court high school, jaipur
Class : Class 6
c

Ans 5:

krishneil from Elpro international school, Pune
Class : Class 6
The CORRECT answer is CCCCCCCCCCC mr SOF

Ans 6:

Riyan from Delhi Public School Kajaguda , Hyderabad
Class : Class 7
Cccc!

Ans 7:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
Class : Class 6
the answer should be option C

Ans 8:

Yashraj from pps, pune
Class : Class 6
My explaination is when we decrease a number by 1/10 times example 100 / 1/10 = 1000 so it increases by 10. If in place of decrease it was increase then b would be the answer but actual answer is c.

Ans 9:

Antara Biswas from DPS Megacity, Kolkata
Class : Class 7
answer should be Cas 100 /10 is 10

Ans 10:

Agneya from Podar International, Mumbai
Class : Class 6
Ans should be (c)

Ans 11:

Bharat from Geetanjali Olympiad school, Bangalore
Class : Class 9
and should be c

Ans 12:

Anshujit Kumar Saha from Garden High School, Kolkata
Class : Class 8
Decreases means division and increases means multiplication.Over here it says decreases and therefore it is division.For example let us take 100.(B) 100/ 1/10 = 100 * 10 = 1000(C)100/10 = 10Therefore,C is correct as 1 moves from left to right.

Ans 13:

Arnav Raj Sharma from Dpsvk, Gurgaon
Class : Class 9
decreasing by 1/10 is not possible . the answer should be (c)

Ans 14:

Shivangi Shivu Singh from Pawar Public School Chandivali , Mumbai
Class : Class 8
c

Ans 15:

Hritvi from Podar International School, Mumbai
Class : Class 7

Ans 16:

from , patna
Class : Class 6
the correct answer is [B] because if we take a no. as 10.ok.then i am doing like example see- 10X1/10 so it is =1 so it decreased

Ans 17:

Arnesh Chakraborty from M P Birla Foundation Higher Secondary School, KOLKATA
Class : Class 8
ans should be cccc.

Ans 18:

ARYAN AGRAWAL from NPS KORAMANGALA, BANALORE
Class : Class 8
it should be B as it is decreased by not increased if it was increased than it was 10

Ans 19:

SHIRIN BHATTACHARYYA from St. Joseph's Convent School, KHANDWA
Class : Class 10

Ans 20:

Prajwal Thakur from South Point High School, Kolkata
Class : Class 9
THE ANSWER SHOULD BE (B) PLEASE VERIFY SOF!!!!

Ans 21:

Ishitadas from Adamas World school , Ichapur
Class : Class 8

Ans 22:

sanjana from NARAYANA E TECHNO , Chennai
Class : Class 8
answer should be c not b

Ans 23:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10

Ans 24:

Omkar Deshmukh from phoenix greens international school, Hyderabad
Class : Class 7
ans should be c

Ans 25:

ADITYA LAL from MOUNT CARMEL SR SEC SCHOOL, UNA, HP
Class : Class 6
how can it decrease by 1/10. it changes by 1/10 and decreases by 10 times answer should be C

Ans 26:

Shivani Shivu Singh from Pawar Public School Chandivali , Mumbai
Class : Class 8
c

Ans 27:

Sumit Biswal from Dps gandhinagar, Gandhinagar
Class : Class 7
Answer should be C

Ans 28:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10

Ans 29:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
ans. should be [C].

Ans 30:

Hritvi from Podar International School, Mumbai
Class : Class 7
the answer is C.. B is the wrong answer . if we have to move the digits from left to right we should multiply and not divide.. please clarify SOF..

Ans 31:

Aaditva from Vasant Valley School, New Delhi
Class : Class 5
C

Ans 32:

Navya from Gyanshree, Noida
Class : Class 6
Ans is C, the most sigma

Ans 33:

Sreejani Bhaduri from National Public School, Bangalore
Class : Class 10
c

Ans 34:

Shreyas K from Kennedy High The Global School, Hyderabad
Class : Class 9
As he is saying times, it should be 10 and not 1/10. So, answer should be C

Ans 35:

Parth Kaushish from MDPS, Faridabad
Class : Class 6
answer should be C because it already says the word divide and if we write ans as B then it will become ( eg. 100/1/10 = 1000) hence it should be ( eg. 100/10 = 10) . PLS CORRECT IT SOF !!!!!

Ans 36:

Sadhika Naorem from Army Public School Narangi, Guwahati
Class : Class 10

Ans 37:

Ashwak from Cambridge, Jalandhar
Class : Class 9
THE ANSWER IS - B

Ans 38:

Aryan Mahanty from Delhi Public School, bangalore
Class : Class 6
The and should be C

Ans 39:

Anika Saha from New Town School, KOLKATA
Class : Class 6
The correct answer is C as 100/10 is 10, 1000/100 is also 10.

Ans 40:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10
answer is bwhen we move from left to rightexample-1000 to 100how do you get 100 by dividing it by 10 right?i.e 1000/10 = 100answer = 1/10

Ans 41:

SKIyer from CNS, Mumbai
Class : Class 6
Ans is (c).

Ans 42:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Its C

Ans 43:

student from school, city
Class : Class 10
The answer is (c)

Ans 44:

Aniket kumar from kendriya vidyalaya, Delhi
Class : Class 8
c is right because we have to multiply cause we are given times.. 1000x___= 100... so we get 1000/10= 10 so c is right

Ans 45:

Soujanya Boyanapally from ,
Class : Class 5
correct ans. should be C

Ans 46:

Viaan Shah from P e s Modern Scholl, Pune
Class : Class 7

Ans 47:

Devasree from Presidium, Ghaziabad
Class : Class 10
answer should be c

Ans 48:

Shivyanshi from Salwan Public School, Gurugram Haryana
Class : Class 9
in synopsis its given that the place value decreases by 10

Ans 49:

Ritabrata Das from OPJS, Angul
Class : Class 7
ans should be C

Ans 50:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The answer is B cause they are saying step by step from LEFT to RIGHT that means it is increasing but as they have said decreasing the answer is B . eg- 10 increases by 10 when it goes from tens to hundred. So it decreases by this formula - 10 divided by 1/10 ( dividing a whole number by a fraction = whole number X the reciprocal of the fraction) = 10x10 = 100

Ans 51:

Ashwak from Cambridge, Jalandhar
Class : Class 9
I think answer is B.....as we have to divide the digit by number 10 each time we move from left to right .....and so its value decreases eg 500 is divided by 10 (500*1/10 = 50) to make its place value from hundred to tens

Ans 52:

Vivaan Kumar from Heritage Xperiential Learning School, Gurgaon
Class : Class 8
The correct answer is (C) because the question asks you by how many times it is DECREASING from LEFT TO RIGHT . If it said increasing, then the answer would be (B)

Ans 53:

Abhijato Chatterjee from Bharatiya Vidya Bhavan, Kolkata, kOLKATA
Class : Class 6
The answer is c. It decreases by 1 by 10 when it goes from right to left, not from left to right.

Ans 54:

Shivani Shivu Singh from Pawar Public School Chandivali , Mumbai
Class : Class 8
look at solution please

Ans 55:

Karmanya Gupta from DPS, Udaipur
Class : Class 8
correct ans. should be C

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Kavitharini Joseph from HUS, Chennai
Subject :IMO    Class : Class 4

Ans 1:

Vedika Kancharla from DDMS P Obul Reddy Public School, Hyderabad
Class : Class 5
b

Ans 2:

Wrik Chatterjee from DELHI PUBLIC SCHOOL NOIDA, Noida
Class : Class 5

Ans 3:

Midhuna from ABCD, Banglore
Class : Class 3
Ya B

Ans 4:

Mitesh from Shishya BEML Public School, Bengaluru
Class : Class 7
hey , it is 90 tenths cause tenths means at the tenths place only . But if if there is another no. like 90 tenths we should multiply . But if you choose hundredth tenths it it will become in thousands value.

Ans 5:

digamber12 from st francies xavier english medium school ajgaon, sawantwadi
Class : Class 4
b

Ans 6:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The answer is B but if anyone has doubt , please call 9243729047 . I will explain it briefly to you .

Ans 7:

Ava from trio, bangalore
Class : Class 2
C

Ans 8:

Vaishnavi from DPS , Singapore
Class : Class 4
B

Ans 9:

SWARIT JAIN from DPS Greater Noida, GREATER NOIDA
Class : Class 9
thank you

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Aarush Pathak from Vibgyor High Magarpatta City, Pune
Subject :IMO    Class : Class 5

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