(1) Multiplication of two digit number by one digit number
Write ones of product at ones place. In given case, 30 is product. So 0 is the ones of product.
Step 2 :-
Carry number of tens over to add in product of number at tens of multiplicand and multiplier.
In this case, 3 is the number at tens place of 30.So carry it over to add in the multiplication of 3 and 5.
Multiply number at tens, ie, 3 and multiplier, ie, 5. Add carry over number in the product.
Adding carry over number 3 in 15 = 18
Multiplication as a whole is shown below:-
(2) Multiplication of three digit number by two digit number
First multiply multiplicand by ones of multiplier.
Multiply multiplicand 652 by number at ones place of multiplier, ie, 4 with carry over.
Now multiply multiplicand by tens of multiplier.
Multiply multiplicand 652 by number at tens of multiplier, ie, 30(= 3 tens) with carry over.
Step 3 :-
Add both products to get final product.
By applying same method, you can solve any large number of multiplications.