When Xiao careless calculates a math problem, he writes the minuend 460 as 640, and the calculated result is 290. The correct result is 1 10.

Calculate the formula according to the meaning of the question:

640-290=350

460-350= 1 10

So the correct result is 1 10.

Subtraction calculation:

If you subtract a number from the sum of several numbers, you can choose any addend to subtract this number and add it to the rest of the addends. For example: (35+17+29)-25 = 35-25+17+29 = 56.

If you subtract several numbers from a number in succession, you can add all the subtractions first, and then subtract the sum of the subtractions from the minuend. For example: 276-115-85 = 276-(115+85) = 76.