I write this as Pumpkin pictured above is recovering from pneumonia so it will be short. Every parent knows that bribery can be a great motivator. Some have mixed feelings about using it. I was the same way. My kids were just going to do what I asked of them because I asked it. LOL. Yeah that worked so well.
I like to use 'earned time' for getting tasks done. For example my eldest daughter who is 9 has a hard time staying focused in her studies. I write out the weeks lesson plans ahead of time. She gets to mark off the subjects completed for visual satisfaction and for every page completed front and back she earns 2 minutes of computer game time. So far this is working, for how long is any one's guess. Her rewards have changed over the years as we have schooled. Use what interests them and you will have success!