1) 7
x3
------
21
2) 3/1 x 7/1 = 21/1 (=21)
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ends with 5 2 ways to multiply
ways to multiply 90 more than 2 factors
Just multiply by 100
You can multiply 2 and 9 to get 18. Alternatively, you can multiply 3 and 6 to get 18 as well.
Find out yourself