Two digit addition and subtraction with and without regrouping is what we are presently working on. This can be a tricky concept for some students. No one strategy is the “right” strategy for students, for every problem. Some problems lend themselves to certain strategies because of the numbers. Students may also switch between strategies, depending on how they’re manipulating the numbers. The key thing to look for is if the student can explain his or her thinking when solving a problem. Students need pretty good fluency with their addition and subtraction facts. If students are spending too much time trying to figure out an addition fact and it’s keeping them from focusing on the strategy, then they need more fluency with their addition and subtraction facts. Here are some strategies students have learned.
A hundred's chart
A Rek n' Rek
Place value:
To do two-digit addition, students need a strong foundation in the concept of ones and tens and what it means to break a number apart into ones and tens.
Here's a poem the students will be learning to help them with this concept of regrouping in subtraction.
We will be doing a lot of practice with these different strategies, however its always a good idea to have extra practice. Here are a few links to printable practice sheets, games and a you-tube video on two digit addition.
Here are some links to activities and practice worksheets:
