Questions tagged [missing-digits]

A puzzle involving a calculation from which some digits have been removed. Different from an [alphametic] in that it is not specified which digits are the same or different from each other.

1
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1answer
152 views

Find the missing number in the matrix

Find the missing number, $x$, in the following matrix $$\begin{matrix} 16 & 13 & 9\\ 11 & 8 & 6\\ 9 & 7 & x \end{matrix}$$
1
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1answer
196 views

Missing number in 5-cell grids

Find the missing number in these grids. I was unable to find any pattern. Choices: 9 6 8 4 source: Borhan Motevasete magazine, Oct. 2007
4
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0answers
578 views

A 4x4 grid puzzle with one missing number [closed]

I can't find any logical relationship in this grid! Could someone help me, please? and choices are A. 8 B. 6 C. 5 D. 4 This book is the source of the puzzle. The translation of its title is ...
4
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1answer
679 views

Number circle with gaps

Does anyone know what this is and how to solve it? Thank you.
6
votes
1answer
444 views

Find the next number [closed]

"I will, of course, kill you if you don't answer. But that's a given, isn't it?" The Enemy says. "So come, Zero, and show me your legendary brain." $2.828,\quad5.196,\quad11.180,\quad18.520,\quad x$ ...
12
votes
1answer
1k views

Can't solve a find the missing number question

I found the following question on the TORN forums, and haven't been able to solve it. $$\begin{matrix}2&9&4&4\\6&0&3&0\\1&3&0&1\\0&5&7&3\\x&8&...
3
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2answers
360 views

Find the missing digits [closed]

How to solve these missing number questions, and what logic should be applied to solve these type of questions?
5
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1answer
271 views

PUZZLE WORLD alphametic

I have tried to solve this but I can't. Does somebody know the answer? Ref: Puzzle World, Ed. Nob Yoshigahara and Richard Bozulich, Ishi Press, Summer 1992, Pilot Edition.
0
votes
2answers
352 views

Find the missing digit in the sequence 0110100011111?0011000011011 [closed]

What digit would you put in place of question mark in the below sequence and why? 0110100011111?0011000011011 P.S. Hint: 0=1, 1=0,...
14
votes
2answers
816 views

What are the missing numbers?

The question is to find the value(s) of *. All the values may be same or different. for example- one of the * could be 8 while another one could be 4. P.S. While cleaning my old cupboard, I came ...
12
votes
3answers
772 views

Reconstructing long division problems

How do I reconstruct the following exact long division in which the digits that have been replaced by letters except for the middle digit - the '8' - in the quotient. I've never seen one of these ...
18
votes
2answers
2k views

Someone has vandalised this long division. Can you reconstruct it?

Oh dear, someone has vandalised this long division. They've replaced every digit either with a wrong digit or a hyphen. Your task: reconstruct the entire thing. There's no remainder. Please show ...
5
votes
2answers
1k views

How many digits can be removed from a division puzzle?

Similarly to How many digits can be removed from a multiplication puzzle and still give only one answer? I am curious about division puzzles. I know this puzzle: . It has only 2 out of 42 digits $\...
5
votes
3answers
973 views

How many digits can be removed from a multiplication puzzle and still give only one answer?

There's a common category of mathematical puzzle which involves determining missing numbers in a long multiplication problem. As an example from this site (problem 10): ...