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100

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100 - Back to the Number Puzzles

Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations (+, -, x, :), root and brackets ().

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.

Pls visit New Puzzles section to see always fresh brain teasers.

100 - solution

100 = 177-77 = (7+7)x(7+(1:7))

I do not know other solutions.

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Posted · Report post

Another solution would be

take 7-7=0

7-7=0

and put the one in front of it which would be100

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Posted · Report post

concatenation isn't a mathematical operator >

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Posted · Report post

How about this?

77+(7+7+7)+(7/7)+1

100=77+23

=77+(21)+(2)

=77+(7+7+7)+(1+1)

=77+(7+7+7)+((7/7)+1)

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Posted · Report post

You're only allowed 4 sevens...not 7 sevens...

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Posted · Report post

uhh its just 7^2+7^2+1+1

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Posted · Report post

uhh its just 7^2+7^2+1+1

That's two 7's, two 2's, and two 1's...not four 7's and one 1.

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Posted · Report post

it is 4 sevens just not 1 one. (7x7)=7^2.

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7 x (7+7) + cubed root of (7+1) = 100

7 X 14 + cubed root of 8

98 + 2 = 100

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Posted · Report post

Hi all,

I thought of a unique solution...

By inverting 2 of the 4 - 7's

1 L7 L7

Ha Ha ! !

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Posted · Report post

Editted - i found the flaw in my answer, nevermind...

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Posted · Report post

How about..

(7 + 1/7) (7+7)

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Posted · Report post

Clever!

I've done a challenge a bit like this: create all numbers from 1-200 using 4 4s and the following mathematical operators: +, -, /, x, ! (factorial), !! (double factorial), INT, MOD, SQRT, ^ (power). You can't do squares etc. - if you use powers the number has to be raised to its fourth power (or 4x4th power etc.).

It is much harder than it looks like!

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Posted · Report post

How about..

(7 + 1/7) (7+7)

SWEET!!

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Posted · Report post

At least Daniel had a very clever answer!

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Posted · Report post

Are you being sarcastic? It was mannu who posted that answer.

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Posted · Report post

ERROR

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What do you mean "error"? Are zou spamming?

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(7*7)+7+7+1 = 100

BTW, it's octal

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Posted · Report post

(7*7)+(7*7)+1=100

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How about ...

(7*7+1) (7+7)/7 = 100

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(7*7)+(7*7)+1=100

Um...that's only 99 not 100.

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How about ...

(7*7+1) (7+7)/7 = 100

nice, but only four 7s are allowed

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Posted · Report post

100 - Back to the Number Puzzles

Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations +, -, x, :, root and brackets ().

The language should be changed in the problem. Drop the word "EXCEPT" and replace it with the phrase "In addition to".

-Brett

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Posted · Report post

100 - Back to the Number Puzzles

Using four sevens (7) and a one (1) create the number 100. Except the five numerals you can use the usual mathematical operations +, -, x, :, root and brackets ().

The language should be changed in the problem. Drop the word "EXCEPT" and replace it with the phrase "In addition to".

-Brett

thanks, I have edited the puzzle ... feel free to check the wording in other puzzles as well

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