Problems
- Using number 7 only 4 times, signs of division, multiplication, addition, subtraction and brackets get all numbers from 0 to 10. For example: 7 + 7 - ( 7 + 7 ) = 0
- Arrange brackets in this equation 4 · 12 + 18 ÷ 6 + 3 to get:
- number 50;
- the biggest possible number.
- Between numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9, written in this order, put signs of addition and multiplication such that the result will be 100. (You cannot use brackets. You cannot combine digits)
- Make these equations correct by using mathematical operations:
- Numbers 2, 4, 8, 16, 32, 64, 128, 256 and 512 arrange in the cells of the table 3x3 such that the multiplication of all number in rows, columns and diagonals is the same.
- Solve this equation: T – W – O = T ÷ W ÷ O = 2 (different letters are different numbers).
- Which number is 7 times more than its last digit.