Here is Multiplication Table of 3. You should learn it by heart to do quick maths.
3 x 1 = 3
3 x 2 = 6
3 x 3 = 9
3 x 4 = 12
3 x 5 = 15
3 x 6 = 18
3 x 7 = 21
3 x 8 = 24
3 x 9 = 27
3 x 10 = 30
Also Read :-
Multiplication Tables 2 to 20
Multiplication Table of 2
Multiplication Table of 6
Multiplication Table of 13
Multiplication Table of 14
Multiplication Table of 15
Multiplication Table of 17
Table of 19