# Math Puzzle of the Week

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Use addition and multiplication to make theese numbers add up to 100:

123456789

You cannot change the order of the numbers. You also cannot use a number two times. You must use them in the order shown. To make it harder, only use 1 multiplication mark!

In my class I showed it to everyone, and the teacher saw it and said she would give a peice of candy to whoever solved it over the weekend. I'm the only one who got candy because no one got it!! The answer will be posted in a week, giving you some time to think...

If you get it right...... I dunno. Maybe there will be some sort of virtual prize.

Each week a new puzzle will be up, cuz I make a ton in my spare time

Edited by Imaginer1
forgot a rule
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[hide]1+2+3+4+5+6+7+8*9[/hide]

That should be it.

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There's at least one more solution.

[hide]1*2*3+4+5+6+7+8*9[/hide]

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I think that needs something else... do your math on a calculator and what do you get?

hint hint- I get 329 with that.

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Are parenthesis allowed? We might have lots of solutions then.

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and there are multiple answers, so to narrow it down to MY answer, use only 1 multiplication mark! muhaha!

parentheses are allowed... usually no one thinks of that! oh, just forget the puzzle

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Your calculator must not do order of operations correctly.

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Likely. Don't you hate that?

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I think i got it.

But maybe i'm thinkin a litlle too much ou the box.

What do you think

[hide]1+2*3+4+5+67+8+9[/hide]

Edited by Fatuus Preteh
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Cap'n Refsmmat had the answer no? Assuming you put the brackets in the right place.

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• 3 weeks later...

The shortest solution (fewest operations) is 123-45-67+89

I think that should do it although I have been wrong before .......once in a past life I think.

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• 1 month later...

1+2+3+4+5+6+7+(8x9)

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• 1 month later...

tat was simple...

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Got it on my 1st try!

I got what harlequinne got although Dr. Tesla's solution seems more creative.

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• 5 months later...

[

[

[

ö

= 33

ö

y

ö

ù

= 39

ù

y

ù

ù

= 33

ö

ö

ö

[

= 27

= 24

= ?

= 24

= 21

Merged post follows:

Consecutive posts merged

How do I post a "table" math puzzle?

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I think I get it -- each row across is, consecutively, 24, ?, 24, 21. But that's not really a puzzle, it's an easily solvable system of equations with four variables. In fact, since there are only four variables, it could be solved for using just the values of the columns and ignoring the rows altogether.

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1*2+3*4+56+7+8+9=100

there's one way using two multiplication marks.

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