having students make a larger designated number of errors in their work, such as 5, and challenging their partner to find all the mistakes displaying particularly challenging mistakes (or mistakes that demonstrate common student misconceptions) under a document camera, and having the whole class look for the error(s) so you can re-teach and extend student learning
For kids that have a basic interest in math, try using daily riddles to keep them thinking throughout the day. At breakfast, you may ask your child a riddle like, "What number has three tens and four ones?" or, "What is a mathematician's favorite dessert?" Your child can take the day to think about the riddle and tell you the answer when you're working on math practice worksheets after school!