Make An Identity: Nine Digits to 100

The task here is to obtain the indicated target numbers by inserting the arithmetic operations of addition (+), subtraction (-), multiplication (*), division (/) or exponentiation (^). For the rules, see the introduction.

Here are twelve problems wherein the targets are to be represented with four all nine non-zero digits in their natural order using only addition and subtraction. Although, all twelve lines look the same at the outset, there are twelve different solutions.

Copyright © 1996-2009 Alexander Bogomolny