## 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

# Using an Open Number Line

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

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

Print Lesson
4 teachers like this lesson
Standards:
Subject(s):
95 minutes

### Kara Nelson

##### Similar Lessons

###### Subtracting with Decomposing
4th Grade Math » Place value
Big Idea: In this lesson, students use tape diagrams in order to subtract and make sense of subtraction as the inverse of addition.
Favorites(9)
Resources(14)
Helena, MT
Environment: Suburban

Big Idea: Place value can help students add.
Favorites(9)
Resources(18)
Memphis, TN
Environment: Urban

###### King's Chessboard
5th Grade Math » Getting Started
Big Idea: If a number is doubled everyday for 64 days will it be in the hundreds? Millions? Billions?
Favorites(1)
Resources(10)
Scottsdale, AZ
Environment: Urban