Directions: Find the missing term in the following number series. 450, 350, 230, ?, 10, -50

Calculate the differences between the consecutive terms: -100, -120, and then -160, -60. The differences themselves change by subtracting 20, then subtracting 40, creating a pattern where the differences are multiples of -20 multiplied by increasing integers. Continuing this pattern, the next difference after -120 should be -120, making the missing term 230 - 120 = 110. Checking the remaining terms, 110 - 160 equals -50, which perfectly matches the end of the series. The result is 110.

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