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Remember that the digits of your answer should all add up to 9. Remember that the tens digit of 9 x some number will be some number minus one.
The nines times table has the great trick that the digits of your answer always add up to 9. This works as follows: 9 x 1 = 09. 0 + 9 = 9 9 x 2 = 18. 1 + 8 = 9 9 x 3 = 27. 2 + 7 = 9 9 x 4 = 36. 3 + 6 = 9. etc. For example, the tens digit of 9 x 3 will be 3-1, or 2. Therefore the answer to 9 x 3 should begin with 2. Use this pattern to help keep you on track: if you find that your answer to 9 x 2 begins with a 4 (and not a 1), you know you have gone astray somewhere.