Addition and Subtraction Concepts 45What is the Take Away Subtraction Concept?
Take away subtraction is one of three types of subtraction.
Take away subtraction involves set removal. In number
stories, a certain amount is removed, eaten, given, lost,
hidden, or otherwise taken away. In a subtraction equation,
the subtrahend is being subtracted from the minuend to fi nd
the difference. In the example 7 – 2 = 5, 7 is the minuend,
2 is the subtrahend, and 5 is the difference. Students
need many meaningful experiences to build conceptual
understanding of take away subtraction.CCSS
Operations and Algebraic Thinking
Number and Operations in Base TenFormative Assessment
To fi nd out if a student understands take away subtraction,
ask the student to tell a story that matches the following
equation: 10 – 4 = 6. Notice if the student uses words
that represent take away subtraction. If the student is not
successful, try a smaller equation such as 4 – 1 = 3 and invite
the student to use manipulatives to demonstrate as he tells
the number story. If the student is successful with 10 – 4 = 6,
give a larger equation such as 25 – 6 = 19 and invite the
student to write the equation and tell a related number story.Take Away Subtraction
CONCEPT: