This book has over 5500 addition and subtraction timed equations for children in the 2nd grade to solve!160 pages Addition and subtraction onlyEquations using numbers 0 to 20 onlyOver 5500 problems to solveA variety of missing digit and normal equationsSolutions includedAdding with digits 0-5, 5-10, 10-15, 15-20, & 0-20Subtracting with digits 0-5, 5-10, 10-15, 15-20, & 0-20Adding and subtracting mixed with digits 0-20Addition: Fill in the missing numbersSubtraction: Fill in the missing n