This page has lots of fun expression sums. If you find an expression
other than the ones I have, please send it to me and I will add it
to the solutions. Rules: Unless otherwise stated, with all sums you can use brackets, parentheses,
sqrt and +, , x, / , . ,^, !.
Don't look at the answers too quickly, it's more rewarding if you try it yourself first.
Use two digits to make the smallest possible positive integer.  Answer 1 
Use six identical digits to make 100. (Can be done with every digit but 0)  Answer 2 
Express with five 3s the number 37.  Answer 3 
Express with four 9s the number
20. 
Answer 4 
Express with four 4s the number
55. 
Answer 5 
Express with five 4s the number
55. 
Answer 5 
Express with five 4s the number
73. 
Answer 5 
Express with five 1s the number
100. 
Answer 6 
Express with five 5s the number 100.  Answer 7 
Combine only plus signs with
five 2s to get 28. 
Answer 8 
1 2 3 4 5 6 7 8 9 =100. Insert just three plus and/or minus signs to make correct.  Answer 9 
Express with five 3s the number
31. 
Answer 10 
9 8 7 6 5 4 3 2 1 = 99. Insert only plus signs to make correct.  Answer 12 
Without using + or  signs express five 8s to get 89  Answer 13 
A half is a third of it. What
is it?

Answer 14 
Express 20 and 48 using each of the following digits three times (1,3,5,7)  Answer 15 
Express with two 8s and two 3s
the number 24. 
Answer 16 
Use all digits (0123456789) to make 100.  Answer 17 
Use only minus signs with all
digits once (0 1 2 3 4 5 6 7 8 9 ) to get 100. 
Answer 18 
Use all the digits once (1 2 3
4 5 6 7 8 9 ) to get 0. 
Answer 19 
1 2 3 4 5 6 7 8 9 = 100. Insert
7 signs to make correct. 
Answer 19 
Use four 4s to get 140 
Answer 19 
Use four 4s to get 31. 
Answer 19 
Without changing order and without using + or , insert multiplication or dividing signs ( * / ) only to solve 1 2 3 4 5 6 7 8 9 = 1  Answer 19 
Use five 3s to get 45 (without using + or )  Answer 19 
Express three correct equations
using three of the four operators (+,x,/), and all of the digits (1234567890). 
Answer 19 
Using all {1,2,3,4,5,6,7,8,9},
complete the following two sets of equations. [ ] x [ ] = [ ][ ] [ ][ ] x [ ]=[ ][ ] 
Answer 19 
Find 2 rational numbers, a and b, a is not equal to b, such that 
Answer 19 
If half of a number squared is
equal to two times the number, what is the number? 
Answer 19 
A ninedigit number uses all the digits from 19. The first digit is divisible by 1. The first two digits combined (i.e. if the number is 123456789 then 12) are divisible by two. The first three digits combined (i.e. if the number is 123456789 then 123) are divisible by 3. This pattern continues until the full number is divisible by 9.  Answer 19 
Make an expression using 7, 8 or 9 eights, which equals 1000. Use only (+, , *, /). 
Answer 19 
Using the numbers 4, 3, 2 & 1 *in that order*, find the first number that can't be made that way, and the last number that can. (using +, , *, /).  Answer 19 
Expand the series a little
further: (ta)(tb)...(tt)...(tz) = ? 
Answer 19 
Make an expression using only four
digits, all 7s, which equals 126. Use only (+, , *, /). 
Answer 19 
Make an expression using only four
digits, 3,3,7,7, which equals 24. Use only (+, , *, /). 
Answer 19 
Make an expression using only four
digits, 1,3,4,6, which equals 24. Use only (+, , *, /). 
Answer 19 
Make an expression using only four
digits, 4,7,7,9, which equals 24. Use only (+, , *, /, .). 
Answer 19 
Make an expression using only four
digits, 2,3,4,5, which equals 28. Use only (+, , *, /, .). 
Answer 19 
What is significant about the equation:

Answer 19 
Make this correct
8 8 8 8 8 8 8 8 = 1 0 0 0 Use only (+, , *, /). 
Answer 19 
Pick six numbers of the set below, and the sum of these six numbers must be 21. 9 9 9, 5 5 5, 3 3 3, 1 1 1 
Answer 19 
Make 383 out of 1, 2, 25, 50, 75, 100 using *,+,,/ . Note : each number have to be used exactly one time. 
Answer 19 
Combine the number 1 to 9 in such a way to obtain three numbers A, B, C, that the first number multiplied with the second number is equal to the third number. Each digit have to be used exactly one time.  Answer 19 
2 x 10 = 2 x 11 is a true statement. Can you explain it?  Answer 19 