Study this problem:
ORIGINAL PROBLEM: 4 ÷ 2/3 = FLIP and CHANGE OPERATION: 4 * 3/2 = REDUCE (if possible): 2 * 3/1 = MULTIPLY: 2 * 3/1 = 6
ORIGINAL PROBLEM: 6 ÷ 3/4 = FLIP and CHANGE OPERATION: 6 * 4/3 = REDUCE (if possible): 2 * 4/1 = MULTIPLY: 2 * 4/1 = 8
Now you get to try a few.