Latin American Subtraction Algorithm
Lisa Nix
Walden University
Dr. Mary Robinson, Instructor
MATH-6562G-1, Base Ten Number System & Operation: Addition/Subtraction
October 21, 2013
Latin American Subtraction Algorithm The Latin American subtraction algorithm is based on the fact that the difference between the two numbers does not change while adding the same amount to the minuend and subtrahend (Indiana University Southeast, n.d.). This algorithm appears to be one that requires precision to detail as it is different from the traditional subtraction algorithm the majority of students have been taught. Regardless of teacher preference, providing students with various strategies allows them to experience the diversity in problem
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A: Exemplary Work
A = 4.00; A- = 3.75
All of the previous, in addition to the following:
B: Graduate Level Work
B+ = 3.50; B = 3.00;
B- = 2.75
All of the previous, in addition to the following:
C: Minimal Work
C+ = 2.50; C = 2.00;
C- = 1.75
F: Work Submitted but Unacceptable
F = 1.00
Adherence to Assignment Expectations
The extent to which work meets the assigned criteria.
Assignment exceeds expectations, integrating additional material and/or information.
Assignment
Based on data from student work samples, benchmark assessments, classroom tests and quizzes, John is able to solve basic multiplication facts with 100% accuracy. He can solve basic division facts with 92% accuracy. John can subtract numbers to the hundred thousands place with regrouping and across zeros with 90% accuracy. He can solve 2 digit by 1 digit multiplication problems with 85% accuracy, 3 digit by 1 digit multiplication problems with 95% accuracy and 4 digit by 1 digit multiplication problems with 90% accuracy. He can solve 2 digit by 2 digit multiplication problems with 85% accuracy. He can solve 3 digit by 1-digit division problems with 83% accuracy. He can identify the correct operation used to solve a word problem with 82% accuracy.
Once calculated the program must be able to compare the students answer and the systems answer to be able to show whether the students answer was correct or incorrect.
At: Students at grade level will be expected to complete 6-8 of the three digit addition problems during the provided activity time. At grade level students will be expected to use at least one of the provided strategies to solve for the sum. Students who finish early will be asked to draw a picture or write and explanation of the strategy/strategies they used to find the sum. The teacher will direct students who are early finishers to complete this task individually. Slow finishes will be provided with three, two-digit addition problems
Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
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You will be asked 10 questions about how you feel about safety in your school. Please choose an answer that reflects the way you feel most correctly. Please remember to be as honest as possible. Your identity will not be shared.
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[The majority of my students have a general understanding of number sequencing. Most of the students in my class are able to skip count by fives and tens fluently, but some students still tend to count by ones or use their fingers when counting. Most of the students in my class are able to count to one hundred or greater, but many of them struggle with counting on from a number other than zero. Although decomposition is a skill we have been working on, many still struggle to understand place value when incorporating hundreds. A common mistake students have made while practicing a similar skill is to try to add or subtract tens from hundred, ones from tens, etc. because they forget to align their units.
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