Can you find an error in Springling&#8217;s open number line?

2nd Grade

Elementary School

Math

Mystery Math Mistake: Springling’s Open Number Line Part 1

Can you find an error in Springling&#8217;s open number line she used to subtract?

Can you find an error in Springling's open number line she used to subtract?

Mystery Math Mistake: Springling's Open Number Line Part 2

Mystery Math Mistake: Springling&#8217;s Open Number Line Part 2

Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through creating your own centimeter ruler. Estimate and measure with a centimeter ruler. 
Math Mights was adapted from IM K-5 Math™ ©2021 by Illustrative Mathematics®, released under the Creative Commons Attribution 4.0 International License (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/. 
Additions and adaptations are ©2021 by Strategic Intervention Solutions, LLC.

Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through creating your own centimeter ruler. Estimate and measure with a centimeter ruler.
Math Mights was adapted from IM K-5 Math™ ©2021 by Illustrative Mathematics®, released under the Creative Commons Attribution 4.0 International License (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/.
Additions and adaptations are ©2021 by Strategic Intervention Solutions, LLC.

Estimate and Measure with Centimeters

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