Reflection: Intervention and Extension Abracadabra - Section 2: Ca...


During this section, I noticed some students had a difficult time communicating their solutions, so I decided to offer them further opportunities to solve addition and subtraction problems in context.

I explain a math situation:

Yesterday, I went to the store. I bought 10 red trucks at Walmart, and 15 blue trucks at Target. How many trucks did I buy? (25)

I gave Tommy 10 of my blue truck. How many trucks do I have left? (15 trucks) How do you know? (Because you had 25 and gave 10 away, if you subtract 25 - 10 = 15)

I continue adding and subtracting trucks until students gain a deeper sense of mental math strategies, as this task is also intended to give students practice with using mental math strategies (such as benchmark numbers) when adding and subtracting numbers.

For struggling students:

Before students solve the problems in partners or small groups, I try to model the process of writing and solving similar story problems with the class. For added practice, I like to use a missing addend problem (similar to those on the student sheet), allowing ample time and incorporating base-tens and place value mats.

  Teacher's Insight
  Intervention and Extension: Teacher's Insight
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Unit 1: Numbers & Operation in Base Ten Grade 2
Lesson 7 of 10

Objective: The students will be able to explain why addition and subtraction strategies work, using place value and the properties of operations.

Big Idea: Students will be able to explain using concrete objects, pictures and words (oral or written) why addition or subtraction strategies work.

  Print Lesson
Math, Number Sense and Operations, reasoning, adding, subtracting, discussin, skill
  55 minutes
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