It would help if you initiated easy topics to get the basics right. You can explain to them what they are exactly is about to do, which is programming. In simple words, programming is commanding your computer to perform tasks and is the fundamentals to run an app, game, or program your kids to play or use.
When you say math in programming, it does not mean filling out a worksheet with arithmetic calculations. Mathematics in programming is about improving a program to perform tasks and solve logical problems using specific mathematics rules. Most of the time, programming will also enhance your kid's problem-solving skills.
The programming language is the medium through which we communicate with the computer. We provide a set of strings input to achieve the desired output. Writing a programming string is known as "command," whereas we command our computer to perform a specific task.