Complete the Number Sequence

Look at the first differences between consecutive terms: $56 - 30 = 26$ $90 - 56 = 34$ Notice that $34 - 26 = 8$. The second difference is 8. Continuing this pattern: Next first difference $= 34 + 8 = 42$ Missing term $= 90 + 42 = 132$ Checking further: $132 + (42 + 8) = 132 + 50 = 182$, and $182 + 58 = 240$, which matches.