Single , Double , Triple , quadruple 1 , 2 , 3 , 4 digit addition and subtraction math problems printables for kids (first ,second ,third,fourth ,fifth and sixth grade elementary children) teachers and parents (homeschooling)56 pages each page has 20 vertical operations ( 1120 in total)WITH AND WITHOUT REGROUPING ( borrowing)some FREEBIES for youSingle Digit Addition Worksheet for 1st & 2nd grade studentsFree Addition &Subtraction Crossword Puzzles for 1st 2nd 3rd Gradersfree number tr