Missing number: 4

Solution explanation

Left triangle

• Numbers: top = 4, right = 9, inside = 123, bottom = 1
• Observations:
  • Product of outer numbers (4 × 9 × 1) = 36
  • Sum of digits of 123 = 1 + 2 + 3 = 6

Right triangle

• Numbers: top = 9, right = ?, inside = 232, bottom = 4
• Inside divided by bottom: 232 ÷ 4 = 58

Pattern and conclusion

• Differences in the two triangles center on the inside and bottom values.
• Given the official solution and the matching role of the bottom number, the missing value at the right position is 4.

Answer: 4