Reflection: Checks for Understanding SMALL, SMALL, BIG - Section 3: Independent Practice

 

As students started the independent practice I was pleased with how well they were taking the numbers, placing them in the large or small boxes, writing and solving an equation. Yeah! Lesson learned.. almost! Suddenly the students came to a problem that presented the smaller number, then the larger number and then a subtraction sign.

Order is everything. Too many of the students did not stop to think before writing the equation. They placed the two numbers incorrectly in the large and small boxes and then tried taking the larger number away from the smaller number. Several of them raised their hands and said that it wouldn't work. Several of them just flipped the numbers and ended up with an answer that did not match the problem. 

What I had thought of as understanding of the concept of larger and smaller numbers and how they work in addition and subtraction problems was more an understanding that you take the first number, subtract the second and get an answer. Had I not presented the numbers in this order, I would have assumed understanding of the concept of how addition and subtraction work. 

By checking for understanding, I know I need to reteach this concept and reinforce the understanding of the concept of subtraction.

  Order is Everything
  Checks for Understanding: Order is Everything
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SMALL, SMALL, BIG

Unit 11: The Numbers Are Getting Bigger
Lesson 10 of 15

Objective: SWBAT connect part-part-whole relationships to fact families to solve for a missing number.

Big Idea: All things are made up of parts and wholes, even math equations. Can you find the parts and wholes of number sentences, even if they are hidden?

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Subject(s):
Math, Number Sense and Operations, addition, subtraction, addition properties
  50 minutes
100 0987
 
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