7*3= 21
7 times 3
You have mentioned '7' three times in the question.This is a tip-off that you could multiply 7 "times" 3 and get 21.
You could use the process of multiplication. It's just a suggestion.
Multiplication factors cannot be used to find divination factors.
8 x 9 = 72
8 times 9= 72
How can you use 2x10 to find 4x10
u can go plus pluse pluse
Use a calculator.
The fact that 8 x 9 = 72
It would seem more sensible to do the multiplication directly.
1 x 7 plus 2 x 7 is the same as 3 x 7