The tricky ones
3 × 7 = 21 and 3 × 8 = 24 are the usual stumbles, because the count crosses 20. Lining up the 3s counted in groups of three (3, 6, 9 | 12, 15, 18 | 21, 24, 27) helps.
Counting by threes
The 3s are the first table that is not a quick rule, so they are where skip counting pays off. Count 3, 6, 9, 12 while tapping three fingers at a time.
3 × 7 = 21 and 3 × 8 = 24 are the usual stumbles, because the count crosses 20. Lining up the 3s counted in groups of three (3, 6, 9 | 12, 15, 18 | 21, 24, 27) helps.
Build from the 2s: 3 × is a double plus one more group. 3 × 7 is 14 and one more 7, so 21.
3 × 3 = 9
Every multiplication fact has a division fact in its family: if 3 × 4 = 12, then 12 ÷ 3 = 4.
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