9x4 can help you find 9x8 because after you find your answer all you have to do is add 9 four more times to get the sum of 9x8.
If you know that 9 4 is 36, then you multiply by two to get 9 8 which is 72, because 36 2=72
You can use 9 × 4 to find 9 × 8 by doubling the result of 9 × 4 , which is 36, to get 72. This method takes advantage of the relationship between the numbers to make multiplication easier. Alternatively, you can add 36 to itself to reach the same result.
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