Problems – We Solve Problems
Filter Problems
Showing 1 to 20 of 52 entries

#### Arithmetic operations. Number identities , Puzzles

In the equation $101 – 102 = 1,$ move one digit in such a way that that it becomes true.

#### Puzzles

What word is encrypted: 22212221265121? Each letter is replaced by its number in the English alphabet.

#### Arithmetic operations. Number identities , Puzzles

Using five nines, arithmetic operations and exponentiation, form the numbers from 1 to 13.

#### Arithmetic operations. Number identities , Puzzles

Using five eights, arithmetic operations and exponentiation, form the numbers from 1 to 20.

#### Arithmetic operations. Number identities , Puzzles

Using five sevens, arithmetic operations and exponentiation, form the numbers from 1 to 22.

#### Arithmetic operations. Number identities , Puzzles

Using five sixes, arithmetic operations and exponentiation, form the numbers from 1 to 14.

#### Arithmetic operations. Number identities , Puzzles

Using five fives, arithmetic operations and exponentiation, form the numbers from 1 to 17.

My Problem Set reset
No Problems selected