Set a timer for a minute and have your children try these timed facts sheets. Each sheet has 30 problems on it, and is grouped by level of difficulty. There is a doubles addition sheet, a mixed addition sheet, and 3 subtraction sheets: 1 each with a whole less than 9, whole less than 12, and whole less than 20.
You can put the sheet in sheet protectors and have students write on it with dry erase markers, or you can print everyone a copy and test them. You can even test some students on subtra