Timed Math Drills - Addition
Drill, drill, and nothing but drill. Twenty-eight pages of drill per book. Here are the sheets you need for practice of each, particular fact. For example, multiplication drill sheets have a separate page for practicing each single factor from x 1 to x 9, mixed on each page (not in predictable sequence like some drill sheets that have 1 x 1 then 1 x 2, etc.). These are followed by nine drill sheets using two different factors (x 0 and x 1; x 1 and x 2; etc.). There are also two drill sheets with mixed problems using factors 1-4, two using factors 5-9, one each with factors 1-3, 4-6, and 7-9, and three with all factors mixed. The last several drills in the book have problems in horizontal format, so students can gain experience with it, also. Every type of multiplication drill you need is here. If your child needs more practice, practice, practice, it's here, here, here.
Yes, there are Answer keys...
The Addition and Division drills have the answer keys printed in the back of the book.
The Subtraction and Multiplication books, however, have a downloadable Answer Key, from a printed web address.