1. (the difficult)
Add, subtract, multiply or divide the following six numbers 2 5 9 9 50 100 to get 356.
Solution: (50 - (9 + 2)) * 9 + 5 = 39 * 9 + 5 = 351 + 5
2.
Add, subtract, multiply or divide the following six numbers 1 6 9 25 75 100 to get 781.
Solution: 75 * 9 + 100 + 6
Another solution: (9 - 1) * 100 - (25 - 6) = 800 - 19 = 781