Reflection: Checks for Understanding Time to Practice - Section 2: Practice Centers


If I had a dime for every time the students wanted to jump from using the manipulatives, to carrying out double-digit subtraction on paper without the blocks, I would be a rich second grade teacher indeed!

Students in second grade often think that the blocks are for babies. They don't realize that the blocks are giving them a chance to understand and demonstrate foundational addition and subtraction concepts.

I reviewed student work to assess understanding.

Today students worked on adding and subtracting with blocks. I had students in that small group with a parent for support. Several of the students tried to do the work without the manipulatives. They said they could do it without, and they switched the numbers and subtracted in columns without grasping the concept. For example, a child subtracted 80 - 27 and write 67 as an answer. She had written the problem in columns but then subtracted the ones and said 7-0 = 7 and then did the tens and had 8 tens - 2 tens is 6 tens, so the answer was 67.  The students who carried out the problem with the base 10 blocks all were able to get the answer correctly.

It is hard to teach addition and subtraction with regrouping. It is something that has to be revisited over and over with manipulatives. Do not rush to the algorithms for addition or subtraction until students really grasp the concepts involved in regrouping and can demonstrate their understanding using the manipulatives. 

  I Don't Need the Blocks
  Checks for Understanding: I Don't Need the Blocks
Loading resource...

Time to Practice

Unit 11: The Numbers Are Getting Bigger
Lesson 7 of 15

Objective: SWBAT use manipulatives to add and subtract larger numbers and solve word problems.

Big Idea: Students need time to practice new skills. They have been introduced to addition and subtraction of double-digit numbers. Today's groups will allow for practice of these skills.

  Print Lesson
2 teachers like this lesson
Math, Manipulative Skills, Number Sense and Operations, addition, subtraction, base ten
  55 minutes
Similar Lessons
10 and Some More
1st Grade Math » Complements of 10 and 20
Big Idea: Your students will play a game where they combine two single digit numbers and then record that total in terms of how it relates to ten.
Waitsfield, VT
Environment: Suburban
Thomas Young
The Recipe for a Great Word Problem
2nd Grade Math » Addition and Subtraction Basic Training
Big Idea: The big idea of this lesson is to have students write their own word problems to help them have a better understanding of mathematical operations, as they relate to real world scenarios.
Pepperell, MA
Environment: Rural
Kristen O'Connor
Adding Several Integers
5th Grade Math » Targeted Skills Interventions
Big Idea: And, and, and, and...
Grand Rapids, MI
Environment: Urban
Erin Doughty
Something went wrong. See details for more info
Nothing to upload