room1: First you can put all the dices on the table and i made it to 8 then at the bottom of the dice you add them up and it gives you your answer-13.
room2: Lined the numbers 1-8 on the table then made 13 then i had to make 9- then 11 then 16, so my final answer was 8,5,4,7,9. Then it means it is 9.
room3: I looked at the circle and found out the difference between the middle of the circle and the edge which is 2.5. Then you double 2.5 which makes 5, then you find out what you have to add to 5 to make 9 and its 4. Then you times 4 by itself which is 16 then make away 1 from 16 which is 15 so thats the answer.
room5: I tried different numbers of cubes and finally found to use 19 cubes. Then i tried arrangeing them into groups of 4 which made 3 left over. So i tried groups of 3 and i got 1 left over so thats my answer.