Hai friends,

When puzzles of this type put on, how effecinetly solve them insted of trying 100's of patters and wasting time

example

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Question:Using 1 through 9 in order, and using only addition or subtraction, create an equation that equals 100.

<Note:I have 10kinds of answers for this>

i.e:. Look at the following example:
Notice that the digits 1 through 9 are used in order to arrive at 106.
1 + 23 - 4 + 5 - 6 + 78 + 9 = 106

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