# The Mental Computation And Estimation

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Operations SS 56 - (Mental Computation and Estimation, Addition and Subtraction, Multiplication and Division)
The Mental Computation and Estimation subtest measures a student 's ability to mentally compute answers to math problems using addition, subtraction, multiplication, and division. Isaac scored well below average. Isaac had the most difficulty with this subtest and was only able to correctly solve one problem. The problem that he solved correctly asked him, “What is one and one more?” Isaac correctly responded with, “2.” He was then asked, “What is 4 and 4 more?” Isaac incorrectly answered with “44.” On the next problem, Isaac was asked, “What is 5 take away 1?” Isaac responded with, “6.” The following item asked Isaac to state what 10 more than 7 was and Isaac incorrectly answered with “13.” The last problem presented Isaac with the numbers 1, 6, 4 and 3. He was asked which of those two numbers could add together to make nine. Isaac responded with, “4 and 3.”
The Addition and Subtraction subtest measures a student 's ability to add and subtract whole and rational numbers. He scored well below average on this subtest. He was able to correctly solve 4 out of the 9 problems correctly. He showed the most difficulty with subtraction. The problems that Isaac solved correctly were 0 + 5, 6 – 0, 7 + 2 and 21 + 7. The problems that he solved incorrectly were 1 + 2, 4 - 2, 8 – 8, 9 + 5 and 14 – 7.
The Multiplication and Division subtest focuses on written algorithmic