Example: I choose to play addition. It shows me that I need to think up two numbers that can make their sum equal to 84. After thinking, I want to use 3 and 81, because 3+81 = 84, this is an integer which will make the formula become one easier integer plus another smaller number. Then the formula is transformed from (27+84) to (27+3+81). Then I got the answer 111. Although it becomes a two-step calculation, it becomes easier to get the answer.
