No matter what materials you choose, it is most important that you supervise your child constantly so that mistakes get caught rather than practiced. I learned this particular lesson the hard way. When my daughter was young, she did something that needed "attention." I no longer remember what it was that she did, but I told her to write the sentence "I will not disobey my parents again" 50 times. I should have known better, but I didn't check on her at the beginning and then I got busy. So, sometime later, she brought me 50 sentences of "I will not disobey my parents agen." She had just practiced misspelling "again" as "agen" __ 50 times! I'm not certain that we ever really got that fixed. This issue of NOT practicing mistakes is extremely important. Parents shouldn't give worksheets as busy work and teachers should only use them if you are going to have a non_math teacher substitute. White boards with supervision are always a better way to practice skills. If you need some time to do chores, your child will get much more benefit by helping you with the chores. And maybe you can work in a little discussion of numbers or counting while you do chores together.
In this modern, technology lead world it is easy to overlook the importance of basic mathematics and mental arithmetic. When every mobile phone has a calculator built in, and every website automatically adds up your shopping cart, who needs to add up in their head? The fact is that mathematics is a vital life skill and as adults we know it is something we use every day in our adult lives. We know that it is essential that we teach our children how to do maths from a young age, but sometimes it is easy to overlook the simple steps we can take at home. We can all remember learning our times_tables at school _ one times one is one, two times two is four, and so on _ but there was a reason why we learnt this way, because it works. But it's not just about learning the times tables in sequence through repetition, it's important to get kids practicing with varying levels of multiplication problem. Working through problems and then checking the answers afterwards is a simple way to practice multiplying numbers.