Reflection: Conferencing Using an Open Number Line - Section 3: Guided Practice


I am convinced that conferencing (combined with being attentive as a teacher) is one of the MOST important teaching strategies during math instruction! I always find teachable moments and opportunities to further support conceptual development. Here are two examples of students making simple mistakes. Both students identified and fixed their own mistakes after I simply pointed to the mistake and asked the questions: Can you tell me more about this? ...Are you sure?

1. This student was using the open number line correctly but struggled with subtracting 500 from 1,293: Subtracting Difficulties


2. Here, the student misinterpreted the problem 2976 -1024 and was solving 2976-924 instead:  Starting at 924 instead of 1024.

  Conferencing: Reflection
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Using an Open Number Line

Unit 5: Adding & Subtracting Large Numbers
Lesson 5 of 16

Objective: SWBAT use an open number line to solve multi-digit addition and subtraction problems.

Big Idea: Students will decompose numbers and take jumps on the number line to model the processes of addition and subtraction.

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student open number line
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