My fourth grader got this problem: Using all four of the numbers 8, 4, 2, 1 in this order make equations that equal 0 through 10. We may use the operations +, -, x and division in any order and any number of times. We have managed to find equations that equal 0 through 7, but we are having problems finding the last 3 equations that equal 8, 9 and 10. Help??