Question

Mentally compute the EXACT product, using equal products.

42×5 A) 205
B) 215
C) 225
D) 235

Answer 1

The EXACT product of 42 × 5 is 210, which is not listed in the options. The closest answer provided is 215, but this indicates there may be a typo or error in the options given. Further clarification from the student would be needed.

Step-by-step explanation:

To mentally compute the EXACT product of 42 × 5, you can use equal products by first rewriting 42 as a multiple that is easier to work with when multiplying by 5. The number 42 can be written as 40 + 2. Now multiply each part by 5:

Now, add the two products together:

200 + 10 = 210

The EXACT product of 42 × 5 is 210, which is not listed among the options provided. However, based on the closest options, the correct answer may be 215 if we consider the possibility of a typo in the question. If it is not a typo, we should communicate with the student for clarification due to the discrepancy between the computed answer and the options provided.