Answer:
19384760918273000
Explanation:
Easy solution:
Add as many zeros to the end as there are in the factor you are multiplying by. Since there are two zeros in 100, add two zeros onto the end of 193847609182730. Hence:
100 x 193847609182730 = 19384760918273000
The important thing to remember is that this will only work when dealing with multiples of 10, e.g. 10, 100, 1000, 100000. You cannot use it otherwise. For any other number, use the full solution.
Full solution:
First set out the problem in the form of long multiplication:
193847609182730
× 100
Now use long multiplication to arrive at the answer:
193847609182730
× 100
000000000000000 ← multiply all the top numbers by the last digit of
the bottom number (zero in this case)
0000000000000000 ← multiply all the top number by the second-last
digit of the bottom number, adding an extra
zero, shown in bold
19384760918273000 ← add two extra zeros to the right hand side of
the solution, then multiply all the top numbers
by the first digit of the second number (one)
Final step is to add all the 'layers' together, but since two of them are only zeros, that makes this step easy, as the bottom layer is the solution. Hence:
100 × 193847609182730 = 19384760918273000
Hope that helps!