Curated OER
Subtraction
Second graders regroup two-digit numbers and solve advanced subtraction problems with regrouping; students use straw and cup manipulatives to demonstrate how to borrow from the tens place in order to solve the problem.
Curated OER
Adding Two-Digit Numbers
In this addition instructional activity, 2nd graders add 6 two-digit numbers together, use tens and ones as models and circle yes or no if they needed to regroup.