How can you show your work for 45×31
write out:
45
x31
___
and do 5x1, than 4x1, than drop the 0 and do 5x3 and carry the 1, multiply 4x3 and add the 1. This should be sufficient work shown.
45
53
-------
135
+2250
----------
2385
Forty five times fifty three is equal to two thousand three hundred eighty five