most children are introduced to the two, five and 10 times tables by year two - at the age of six and seven. between the age of seven and eight, children start to learn the three, four and eight times tables. the hardest multiplication is 6×8, which students got wrong 63% of the time. this was closely followed by 8×6, then 11×12, 12×8 and 8×12. the easiest multiplication, on the other hand, was 1×12, which students got wrong less than 5% of the time, followed by 1×6 and 9×1.