The tricky ones
9 × 6 = 54, 9 × 7 = 63 and 9 × 8 = 72 cause trouble (54 and 45 get swapped). Checking that the digits add to 9 catches most mistakes.
Ten groups take away one
The 9s are full of patterns: the tens go up while the ones go down, and the digits of each answer up to 9 × 10 add to 9. Children also love the finger trick.
9 × 6 = 54, 9 × 7 = 63 and 9 × 8 = 72 cause trouble (54 and 45 get swapped). Checking that the digits add to 9 catches most mistakes.
Do 10 × and take one group away: 9 × 7 is 70 − 7 = 63. The tens digit is one less than the number you multiply by: 9 × 7 starts with 6.
3 × 9 = 27
9 × 4 = 36
Every multiplication fact has a division fact in its family: if 9 × 4 = 36, then 36 ÷ 9 = 4.
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