Analyze the following computations. Explain what is wrong in each case.
A. 135+47=172 B. 57-38=21
A. didn't carry the 10
B. Dyslexia. 58-37 = 21
To analyze the computations, let's go through each case and identify what is wrong:
A. 135 + 47 = 172
To verify the correctness of this addition, you need to add the two numbers correctly. Start by adding the rightmost digits (5 + 7) which equals 12. In this case, the correct sum should be written as 172, not 162. Therefore, the mistake lies in the addition of the last digit.
B. 57 - 38 = 21
To verify the correctness of this subtraction, you need to subtract the second number from the first number correctly. Start by subtracting the rightmost digit (7 - 8). As you can see, the result is -1, not 9. Therefore, the mistake lies in the subtraction of the rightmost digit.
To avoid these errors, it is essential to pay attention to each step of the computation and double-check the addition or subtraction of each digit. By doing so, you can minimize the chances of misplacing digits or incorrectly calculating the sum or difference.