When I pick the highest prime number, it makes me feel really smart. I also like it when I find a factor when it's the other person turn. Adding the totals was really fun.
Making an array is good because when you make all the possible ways then you can find the factors like: 4 by 5, 2 by 10. 1 by 20 so 1,2,4,5,10, and 20 would be all the factors of 20.
I really liked lesson 1.5 on page 14 and 15 because you had to figure out if a number was a multiple of 2,3,6,9,5, and 10. to do that you had to use all the strategies to figure out the question. Example:
2; the second number had to be an even number(2,4,6,8,0)3; the digits had to add up to a multiple of 3, 6; it has to be a multiple of 2 and 3, 9; digits add up to a multiple of 9, 5; The last digit is 5 or 0, 10; The last digit is 0.