Multiplication Problems

During lock-down I am learning to use multiplication to solve problems 

for example  15 x 26 =? what I would do is use the 10 from 15 and times it with the 

26 = 10 x 26 = 260 I know that because 10 x 20 = 200 + 60 = 260 

then I use the 5 from the 15 times it once again with the 26  so

5 x 26 =? what I would do is 5 x 6 = 30 then 5 x 20 = 100 because 5 x 10 = 50 

so 260 + 130 = 390 so their for 15 x 26 = 390 

tell me would you use multiplication to solve problems? 

also here is an update of my multiplication problems

Learn: 

we are learning to solve problems with multiplication!.