No. Take 12 for example. 1+2=3 but 1x2 doesn't equal 3, it equals 2.
Multiplying a 2-digit number by a 1-digit number involves multiplying the digits in the ones and tens place and then adding the products. Similarly, multiplying a 3-digit number by a 1-digit number follows the same principle, where you multiply the digits in the ones, tens, and hundreds place and then add the products. The main difference is that in the latter case, you are dealing with three sets of digits to multiply and add, whereas in the former, you only have two sets of digits.
3333
98
10,234
44? ? ?
No.
The greatest 3 digit number is 999, and all three digits are the same.
1002345678
1.111
100000000
-8
9876