Whole numbers include zero and the counting numbers (1, 2, 3, 4...). Therefore the "higher" number is always greater. If we picture a number line the number that is farther right will always be greater. In this case 11 is greater than 5.
Integers include all the whole numbers and the negative whole numbers too. Since we're using a number line we can see that all positive numbers (and zero) are greater than any negative number. Here we can see that 2 is greater than -6.
If both numbers are negative, the "smaller" (absolute value) number will be greater, since it will be farther right. As you can see, -3 is greater than -10.
Sums, Sum & Difference, and Products
The key to these levels is to calculate the left card first (it appears a fraction of a second before the right) and then "store" that answer while you calculate the right side and compare. Don't guess, since it's -3 point for every wrong answer.
This level is made of fractions with denominators of 2, 4, 8, and 16. Therefore finding a common denominator is easier, since it will always be 4, 8 or 16. The number line still works if you prefer.