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6x7=42 42x8=336 That is your answer, I hope I helped! ;)
Jeremiah Codrington ∙
1x2x3=6 2x3x4=24 3x4x5=60 4x5x6=120 5x6x7=210 6x7x8=336 7x8x9=504 8x9x10=720 9x10x11=990
The 12-year, 14-year, and 16-year cicadas will all come up together again in 336 years (the least common multiple of 12, 14, and 16).