Hardest sum in the times tables is 9x6 Summary The times tables have been the bane of childhoods for millennia. Now, research has found that 9x6 is the sum that most frequently stumps today’s children. Other Related Coverage Why 9 x 6 sums up our trouble with times tables | The Times It’s OK to struggle with times tables — I did and I’m a mathematician | The Times Hardest times tables question that stumps millions of Brits is revealed | The Sun Adrian Chiles: Struggling with the nine times table? I have a failsafe method | The Guardian