## 1 2 3 4 5 6 7 8 9 = 100

This equation is incomplete: 1 2 3 4 5 6 7 8 9 = 100

One way to make it accurate is by adding seven plus and minus signs, like so.

1 + 2 + 3 – 4 + 5 + 6 + 78 + 9 = 100

How can you do it using only 3 plus or minus signs?

123 – 45 – 67 + 89 = 100

Posted in Brain Teasers

39 Comments on "1 2 3 4 5 6 7 8 9 = 100"

Jessica says
April 7, 2015 @ 09:34

That is very clever

Tamoshi says
April 8, 2015 @ 00:48

123-45-67+89=100
^_^

Jackie says
September 27, 2016 @ 22:50

Idk that’s how

Akshat says
November 19, 2016 @ 00:10

1+2+3+4+5+6+7+8×9=100

Niyibizi says
December 7, 2016 @ 13:31

this require a person with above 100 IQ

iko says
January 10, 2017 @ 12:35

1 2 3 4 5 6 7 8 9=50
?

Yared Genene says
April 19, 2017 @ 03:45

1*2+3*4*5-6+7+8-9=100

Laquanda says
August 17, 2017 @ 18:08

1+2+3+4+5+6+7+8×9=100

Sjörk says
October 24, 2017 @ 05:24

1+2+3+4+5+6+7+8×9=100

@Yared Genene That’s 62.

Thanks to Laquanda and Sjörk, but the riddle asked how you could use only 3 plus or minus signs.

iPhone 5 says
December 13, 2018 @ 10:40

52+39+6-8+7+4×1=100

JENEEFUN says
February 27, 2019 @ 01:14

1 x [ (2×9) + (3×8) + (4×7) + (5×6) ] = 100

Kumkum says
October 10, 2019 @ 12:31

Dainius says
November 7, 2019 @ 13:19

123-4-5-6-7+8-9=100

Phuluso maliavusa says
February 10, 2020 @ 02:39

9 – 8 + 7 + 65 – 4 + 32 – 1 = 100

yodesmane says
March 5, 2020 @ 11:41

123 – 45 – 67 + 89 = 100

Ahnaf Ishiq says
March 27, 2020 @ 06:29

123 – 45 -67 + 89 = 100
(1×23)-4+5-6-7+89=100
(1-2+3-4+5)×6-7+89=100
78+9+6+5-4+3+2+1=100
(56-34-12)×(9+8-7)=100

Ahnaf Ishiq says
March 27, 2020 @ 06:30

1+2+3+4+5+6+7+8×9=100

Grace Knaf says
April 13, 2020 @ 10:20

@Dan
dont need that negativity, they are just trying to help (they were actually helpful to me)
who else is here in 2020 quarantine?
also found another solution:1*2*3*4+5+6+7*8+9=100

Now now Grace, let’s be positive :)

uuuuuuu says
April 14, 2020 @ 13:40

why

Tubz says
April 18, 2020 @ 16:18

Have got it using all single digits
1+2+3+4+5+6+7+8×9
Using a 2 digit number
1+2+3-4+5+6+78+9=100
Using a 3 digit number
123-4-5-6-7+8-9=100
Anyone find a way using a 4 digit number??

Sarah says
April 21, 2020 @ 21:25

Amazing riddle

hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii says
May 19, 2020 @ 16:31

soooooo who is here in 2020 quarentine teehee covid- 19 CoRoNa Time

Siddhant says
August 5, 2020 @ 03:22

Using digits 1to 9 in ascending order and using sign +,- maximum 3 times in total find a equation = 100

lulu says
October 26, 2020 @ 08:16

123 45 67 89 100

Idk says
November 2, 2020 @ 05:20

1+2+3+4+5+6+7+8+9 = 123456789

O <
\__/

Tulip says
December 15, 2020 @ 04:00

23×4+5-6+7-8+9+1=100

123 – 45 – 67 + 89 = 100

Deepak murmu says
January 9, 2021 @ 21:07

123+4+5+67-8+9=200
987-654-32-1=300
9+876-54-32+1=800
98+765+4+32+1=900
987+6+5-4+3+2+1=1000

Deepak murmu says
January 9, 2021 @ 21:12

987654321*9+987654321=9876543210
123456789*9+123456789=1234567890
123456789*2+987654321-9=1234567890

Pennywise says
February 1, 2021 @ 04:26

123 – 45 – 67 + 89 = 100

MUHAHAHAAAAA

laray kiene says
February 3, 2021 @ 08:03

1+2+3+4+5+6+7+8×9 does not equal 100 it equals 324. search it up! use ur calculator. but thank you for the others that have given other calculations you really helped me with my maths work!

Deepak murmu says
February 3, 2021 @ 11:06

123+45+67+89=324 I use my calculator

Ruby says
May 20, 2021 @ 13:47

1+2+3+4+5+6+7+(8*9)

i.m.verystupid says
July 29, 2021 @ 01:55

the correct answer is -1+2+3+4 x 5 x 6 -7-8-9

Pretty smart guy says
October 16, 2021 @ 17:33

8
∑3n-1 = 100
n = 1

Louis says
October 27, 2021 @ 02:46

1+2+3+4+5+6+7+8×9=100

100?!

Tim says
February 15, 2022 @ 17:42

I have over 600 ways of doing this. I have been teaching Maths for almost 40 years and have set this challenge to my pupils every year. Some of the solutions are wonderfully arcane and others are astonishingly simple.