Lichen puzzles give your students practice with multiplication and subtraction. Children will be asked to do products like 2 x 13 = 26 and 5 x 8 = 40.
The puzzle is also perfect to revisit basic multiplication in later grades because top students will be deflected into tough problem solving (never a waste of their time) while you can focus on getting the rest of the class caught up curricularly.
Standards for Mathematical Practice:
All MathPickle puzzles are guaranteed to engage a wide spectrum of student abilities while targeting the following Standards for Mathematical Practice:
MP1 Toughen up!
This is problem solving where our students develop grit and resiliency in the face of nasty, thorny problems. It is the most sought after skill for kids.
MP3 Work together!
This is collaborative problem solving in which students discuss their strategies to solve a problem and identify missteps in a failed solution. MathPickle recommends pairing up students for all its puzzles.
MP6 Be precise!
This is where students learn to communicate using precise terminology. MathPickle encourages students not only to use the precise terms of others, but to invent and rigorously define their own terms.
MP7 Be observant!
One of the things that the human brain does very well is identify pattern. We sometimes do this too well and identify patterns that don't really exist.
Common Core State Standards:
Lichen Puzzles targets the following grade 3 Common Core State Standards.
Fluently multiply and divide within 100, using strategies such as the relationship between multiplication and division (e.g., knowing that 8 × 5 = 40, one knows 40 ÷ 5 = 8) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers. (http://www.corestandards.org/Math/Content/3/OA/)
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
These lichen puzzles are great for "sneaking" in a connection to symbiotic relationships in science. Any time you can make a cross-disciplinary connection - do it ;-)
Photocopy these worksheets for your own students as often as you like. Please leave feedback for me.