# Can You Solve This Math Problem?

I love stories about people who didn’t give up. Miles Levin is such a story. Stories of perseverance help to motivate us in all aspects of our life, including our financial lives. But how do we teach perseverance to our kids? That was my challenge this weekend when my son was trying to solve a difficult math problem.

Using the numbers 1 through 9 in order, construct a math problem that equals 100.

Simple enough, right? If you can add, subtract, multiply and divide, you can solve this problem. When the answer didn’t come easily to him, he wanted to give up. But through encouragement (ok, and some threats, too), he worked through the problem and solved it. I told him that life is a series of problems, just like this one. And at each step in life, you have a choice–give up or keep trying. And we answer that question every day, whether we realize it or not.

So can you solve the math problem? Leave a comment if you think you’ve got the answer. Oh, and here’s a hint: You can use parentheses to change the order of operation.

Topics: Personal Finance

### 60 Responses to “Can You Solve This Math Problem?”

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

2. Rob, well done. What I like about this math problem is how simple the solution appears. There are other ways to solve the problem, by the way, so leave a comment if you have figured out these other alternatives.

3. I have three possible solutions – two from my son; one from my son-in-law. Here they are:
1.
100 = (1+2+3+4) x [(5-6) x 7 + 8 + 9]

2.
1-2*3-4+5*6+7+8*9 = 100. I like this because, though parentheses could be applied, you don’t need them if your order of operations is correct. I’m mucking around with something more creative (exponents are allowed, right?)

3.
I think I could come up with the simple ones with a C program (sigh – it was going to be a shell script, but C handles arrays better) — there are eight operands, and (presuming simple math plus exponents) five possibilities for each operand: + – * / ^, which means 5^8 combinations, or 390625. All you have to do is build a 390625 row array with eight columns, each row representing a possible combination. Then you run something that translates, say,

1 1 1 1 1 1 1 1 into 1-2-3-4-5-6-7-8-9, and evaluates whether that equals 100.

After that, it’s, as my high school geometry teacher would say, “just plug & chug”

• how they solve this porblm?? may i hav the code? i want the code for number 2 problm, i try to do this with c language,but i cant do . can u help me?

• how they solve this porblm?? may i hav the code? i want the code for number 1 problm, i try to do this with c language,but i cant do . can u help me?

4. Al, very, very nice. Now if I can just think up a great article with the title, “Just Plug & Chug.”

5. One more (many possible variations):
1 + ((2 + 3 + 4 – 5 + 6 – 7 + 8) * 9) = 100

• WHAT A NICE QUESTION THAT I CANT ANSWER…….HAHAHAH…

6. obviously, that should be an 8 then ) — not a “cool face”

7. Sara, very nice. This “simple” math problem reminds me that there are often multiple solutions to the same problem or challenge. Money is the same way. There are definitely many wrong answers. But there are also several paths that each can get us to our goals.

8. What is the future value, if the present value is \$1 and the interest
rate is 2% annually after 7 years?

• I think the answer is 30…..

9. what is the future value, if the present value is \$5 and the
interest rate is 3% annually after 10 years?

10. You have a savings account with \$100 earning 4% annually. What
would the value of this account be after 30 years?

• Linda, the answer will depend in part on the rate at which the interest compounds (daily, weekly, monthly, annually). But that said, my answer for this and your other questions is (in round numbers) \$324.34, \$6.72 and \$1.15.

11. Find the numbers

Use each of the digits 0-9 only once, to write five two digit numbers, which has the sum of 288

12. You have been hired by a day care agency to fence in an are a to be used for a playground. You have been provided with 60 feet of fencing (in 4-foot sections) and a foot gate. How can you put up the fence so the children have the maximum amount of space in which to play?

13. i am receiving a \$20 million which has to be divided among 270,000 people, so how much will we all receive?

• \$740,740.74

14. Sabrina is it \$20 million? :O

You have to use a rectangle of maximun area i.e. a square , the perimeter is 60 feet of fencing plus 1 foot of gate: all together 61 feet, you build a square with a side of 61/4 each.

16. What is 38-(-23-7.6-3^3*-17)?

17. use the numbers 1 thru 9 to solve.

__ / __ x __ + __ x __ x __ / __ + __ x __ = 100

• My 6th grader has the same problem. Nice to waste time on this 🙁 Sorry I do not have an answer either.

• Found this on the internet. Thanks to someone. Here is 25 of the 199 answers he had.

1 1/2*7+5*3*6/9+8*4
2 1/2*7+5*6*3/9+8*4
3 1/2*8+5*3*6/9+7*4
4 1/2*8+5*6*3/9+7*4
5 1/3*6+5*2*8/7+9*4
6 1/3*6+5*8*2/7+9*4
7 1/3*6+7*2*8/9+4*5
8 1/3*6+7*8*2/9+4*5
9 1/3*8+9*2*6/7+5*4
10 1/3*8+9*6*2/7+5*4
11 1/3*9+4*2*6/7+8*5
12 1/3*9+4*6*2/7+8*5
13 1/4*7+2*3*6/9+5*8
14 1/4*7+2*6*3/9+5*8
15 1/4*8+7*3*6/9+2*5
16 1/4*8+7*6*3/9+2*5
17 1/6*2+5*3*9/8+7*4
18 1/6*2+5*9*3/8+7*4
19 1/6*2+7*3*4/8+9*5
20 1/6*2+7*4*3/8+9*5
21 1/6*8+2*3*9/5+7*4
22 1/6*8+2*9*3/5+7*4
23 1/9*3+2*6*8/7+4*5
24 1/9*3+2*8*6/7+4*5
25 1/9*5+8*3*4/7+2*6

18. use all 9 numbers only once to create a fraction that equals 1/3 (1, 2, 3, 4, 5, 6, 7, 8, 9)

19. I have a book named “Foundations of Financial Management”.
Author: Stanley B. Block and Geoffrey A. Hirt (12th Edition).

In this book, there have a lot of problems of math. It has no solution. So, I need specific solution of Chapter-6: Working Capital & Financing Decision. Problems No: 7, 9, 10, 11, 12 & 13.

If you provide me, I will be grateful to you.

20. Solve these problems that are given below.

1. Stern Educational TV, Inc., has decided to buy a new computer system with an expected life at three years at a cost of \$200,000. The company can borrow \$200,000 for three years at 12% annual interest or for one year at 10% annual interest.

a. How much would the firm save in interest over the three year life of the computer system if the one year loan is utilized, and the loan is rolled over (reborrowed) each year at the same 10% rate? Compare this to the 12%, three year loan.

b. What if interest rates on the 10% loan go up to 15% in the second year and 18% in the third year? What would be the total interest cost compared to the 12%, three year loan.

2. Assume that Atlas Sporting Goods, Inc., has \$800,000 in assets. If it goes with a low-liquidity plan for the assets, it can earn a return of 15%, but with a high-liquidity plan the return will be 12%. If the firm goes with a short-term financing plan, the financing cost on the \$800,000 will be 8%, and with a long-term financing plan, the financing cost on the \$800,000 will be 10%.

a. Compute the anticipated return after financing costs with the most aggressive asset-financing mix.

b. Compute the anticipated return after financing costs with the most conservative asset-financing mix.

c. Compute the anticipated return after financing costs with the two moderate approaches to the asset-financing mix.

3. Lear, Inc., has \$800,000 in current assets, \$350,000 of which are considered permanent current assets. In addition, the firm has \$600,000 invest in fixed assets.

a. Lear wishes to finance all fixed assets half of its permanent current assets with long-term financing costing 10%. The balance will be financed with short-term financing, which currently costs 5%. Lear’s earnings before interests & taxes are \$200,000. Determine Lear’s earnings after taxes under this financing plan. The tax rate is 30%.

b. As an alternative, Lear might wish to finance all fixed assets and permanent current assets plus half of its temporary current assets with long-term financing and the balance with short-term financing. The same interest rates apply as in part b. Earnings before interests & taxes are \$200,000. What will be Lear’s earnings after taxes? The taw rate is 30%.

21. my math question :
we have 1oo coins that one side them is white and the other side is black .
we put 7 of the coins in white side and the others (93) in black side .
now we want a blind person to divide the coins into X parts that the number of white coins in all the parts be the same .
how can the blind person do that ?
I will wait for your respond , thanks .
naviffir

22. 1+2+3=4
the way to do this is set it up with straws or sticks or something and you only can move on stick to get it equal to 4

23. 1+2+3=4
the way to do this is set it up with straws or sticks or something and you only can move one stick or straw to get it equal to 4

24. adding and subracting fractions.. can you explain it to me how did you get the 14
7/9 +1/8-1/6= 14/18+1/18-3/18
=14+1+3/18

=12/18
=2/3
can you explain it to me how you solve it thanks

25. __ / __ x __ + __ x __ x __ / __ + __ x __ = 100

What is the answer to this question? I have to use 1-9 whole numbers and only each number twice

26. I need to solve this math problem …

using numbers from 1 to 9 ( 1,2,3,4,5,6,7,8,9)

__ __ X __ __ __ = __ __ __ __
the numbers should not repeat, and it should be between 1 to 9 only.

27. if sale amount is 300080 and profit margin is 6% and expense is 2.5% what will be the net profit

28. A surveyor measured a triangular plot of ground and reported three angles as being 58.2 degrees, 70.0 degrees and 61.1 degrees. How much of an error did the surveyor make?

29. evaluate each expression.
1_(-2)+3=
2_(-3)+5+(-5)+12
how do u solve this and thx

30. Using four’s 8’s and any mathematical operation , how can I create the numbers 1-25

31. Challenge for All

590822 (?) (?) = 302259

(?) 1 question mark for sign and (?)2 question mark for value

• (?)1 question mark is a negative sign(-)
(?)2 question mark is 288563

Life is that simple but COMPLICATED….**cheerzz**

• (8+8)/(8+8)=1
(8/8)+(8/8)=2
(8+8+8)/(8)=3
(8*8)/(8+8)=4

8-[(8+8)/8]=6
[(8*8)-8]/8=7
8+[(8-8)*8]=8
[(8*8)+8]/8=9
8+[(8+8)/8]=10

i wuld leave d rest 2 u guyz…. i didnt get 5 though
**cheerzz**

32. use the numbers 3,5,6,2,54 and 5 in that order to write and expression that has avalue of 100

33. please could you solve to me this math problem

use the numbers 3,5,6,2,54 and 5 in that order to write and exprassion that has value of 100.

thank you

34. principle 1000
rent 12% p y
time 3 years
get the amount & C I

35. __*_=__+__=__ complete the equation only 1 to 9. no repetition

36. CAN YOU SOLVE THIS??

A developer sell 2 lots that are each 60 X 100 for \$20 per square foot each. On the first lot she makes a 20% profit. On the second lot, she suffers a 20% loss. Calculate her net profit or loss.