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; doubles, make ten, friendly numbers, counting on, counting all... Students have learned how to use a
A Rek n' Rek
51+26 on a hundreds chart
and this week we are learning to use place value mats.
46= 4 rods (40) 6 units (6)
22= 2 rods (20) 2 units (2)
4 tens 6 ones is 46
2 tens 2 ones is 22
Add them up and you have 68!
Two Digit Addition Tips:
*Always line up the ones and the tens columns
*Add the ones column first, then add the tens column
