Use this activity to engage your students in challenging mathematics in a fun way! The “Mystery Number” clues draw from 3 Common Core State Standards:
2.NBT.A.3 Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
2.NBT.B.6 Add up to four two-digit numbers using strategies based on place value and properties of operations.
2.NBT.B.8 Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
Students will need blank hundreds charts, and red and purple crayons or colored pencils to complete the activity.