Warm up with a Mystery Math Mistake to decompose teen numbers. Use a double 10-frame to represent adding three single-digit numbers. Play a game with 10-frame cards to add numbers. The one with the greatest number wins!

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.