Children's Technology Review awards DotToDot numbers & letters 4.2 out of 5 stars
Featuring outstanding management features, lots of levels ... this collection of 42 dot-to-dot puzzles can be used to practice counting, the alphabet, or times tables.
DotToDot takes this to the next level with fun pictures, filled in on completion, timed modes where kids have to finish in a certain time to open the next level and number sequences based on times tables so that older kids can still use the app to practice their arithmetic
Technology in education
An excellent app to teach numbers/letters/multiplication tables.