1 x 21, 3 x 7
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10.5 x 2=21
Any number can be multiplied by 21
Any number can be multiplied to get the answer 441. For example 5 can be multiplied by 88.2 If the question was which number can be multiplied by itself, the answers are: -21 and +21
3*7 = 21
2+21=23 2*21=42 (* is another symbol for multiply)