IDNLearn.com provides a comprehensive solution for all your question and answer needs. Ask anything and receive comprehensive, well-informed responses from our dedicated team of experts.
Answer:
1021
Step-by-step explanation:
1+1=2 and it needs to add up to 4 so you add in another 2 in the only place left for it to go which is in the tens place because the first and last number have to be the same and 0 has to go in the hundreds place.