2 and 3 Digit Addition and Subtraction
Addition

VA SOL 2.6 The student, given two whole numbers whose sum is 99 or less, will
a) estimate the sum; and b) find the sum, using various methods of calculation. 
Subtraction

VA SOL 2.7 The student, given two whole numbers, each of which is 99 or less, will
a) estimate the difference; and b) find the difference, using various methods of calculation. 