This week, we introduced our first graders to a new addition strategy called “Make a 10″. For the equation, 9 + 4 = ___, we can “count on” to find the total of 13. Since the total, 13, is a teen number (which has a 10 hiding inside) we helped our students notice that 9 + 4 = 10 + 3. Both of these equations produce the total 13, but solving 10 + 3 is quicker and more accurate.
We will spend much of our math time next week working with this new strategy as it is still very new and fragile.