Two-Digit Addition and Subtraction. Time to assess kids will be inserted when we know what time that will occur!. Solve the following problem: 28 + 16 = ?. Without paper and pencil (please)
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Time to assess kids will be inserted when we know what time that will occur!
How do these tasks connect to the Grouping Tens videos?
Roll and Add
What did he score?
What evidence was there about his mathematical understanding?
What questions do you have about Brian’s understanding?
Add ‘Em Up - Lots of Lines
Add ‘Em up- Yarn Shapes
Now we want you to come up with 6 related subtraction problems.
Two of them should include the number 52.
Two of them should include the number 24.
Two of them should include neither 52 or 24.
“Subtracting Numbers to 100”
Read your assigned strategy.
Be prepared to share with the group:
1. What is the strategy?
2. Show an example
3. How does it relate to the assessment?
Roll and Subtract
Two Ten Shapes Subtraction
Partner Take Away
By the end of 2nd grade students need to have basic facts memorized (2 seconds or less).
By the end of 2nd grade students need to have multiple strategies and ways to think about subtracting 2-digit numbers.
By the end of 2nd grade students need to be proficient with the standard algorithm for subtraction.
By the end of 2nd grade, getting the answer to a 2-digit addition or subtraction problem efficiently (in a few quick steps) is a reasonable expectation.
What are the addition/subtraction strategies that students typically work with in 2nd grade?
How can this last assessment and the concepts in it support students’ strategies?
Assess your students….
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