**Title:** Please Excuse My Dear Aunt Sally As She Makes the Number 24

**Description:**
The students get 4 numbers presented on a number card. With these numbers and an interactive calculator, students try to compute the number 24. Students use order of operations to solve a numerical expression that equal 24.

**Standard(s): **

[MA2013] (3) 8: Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. (This standard is limited to problems posed with whole numbers and having whole-number answers; students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations).) [3-OA8]

[MA2013] (3) 9: Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. [3-OA9]

[MA2013] (3) 11: 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. [3-NBT2]

[MA2013] (3) 12: Multiply one-digit whole numbers by multiples of 10 in the range 10 - 90 (e.g., 9 x 80, 5 x 60) using strategies based on place value and properties of operations. [3-NBT3]

[MA2013] (6) 14: Apply the properties of operations to generate equivalent expressions. [6-EE3]

[MA2013] (6) 15: Identify when two expressions are equivalent (i.e., when the two expressions name the same number regardless of which value is substituted into them). [6-EE4]