# Add as few plus signs as possible to make equation true

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The equation below is not true. The only allowable way to change the equation is to insert plus signs between some of the digits. Find an example of using as few plus signs as possible to make the expression on the left equal to the expression on the right.

$$123456789 = 987654321$$

This puzzle was inspired by this one: How to solve 1 2 3 4 5 = 5 4 3 2 1 (insert five pluses to make it equal)? A thorough solution needed

• I have a solution with 16 plus signs. The clock is ticking! Dec 11, 2023 at 6:08
• Truly the best mathematician of all time @DanielMathias Dec 11, 2023 at 6:12
• I have a solution with zero, but you’re not gonna like what I’ve done with bases. Dec 11, 2023 at 8:20
• @Sneftel I am curious about your solution; please post it. Dec 13, 2023 at 5:42