Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
-- a. 10 can be thought of as a bundle of ten ones — called a “ten.”
-- b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
-- c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
Submitted by Ktricomo on Thu, 02/19/2015 - 12:32pm.
This unit is designed to teach addition and subtraction with regrouping to second graders. It includes links to online resources, videos created using SMART Board, Educanon and Plotagon. Links to sites are included to provide support to different learners, and activities were selected to develop the language needed to explain the steps in the algorithm.