A heuristic you can use to do multiplication easier is with multiples of 9.

Any number 2-9 multiplied by 9 can be easily solved like this:

The tens place will be the number you are multiplying by 9 subtracted by 1. For example, 9*6, the tens place will be 5.

The ones place will be the number in the tens place plus whatever number would make it 9. In our example, 9*6, the ones place would be 4, because 4 + 5 is 9.

I hope this helps!
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