It took Marty 42 minutes to write a book report then he spend 18 minutes correcting his report explain how you use mental math to find how long Marty spend on his book report
it took Marty 60 minute to finish the report mentally you add 42 plus 8 is 50 plus 10 (because 18 minus 8 is 18) then that equals 60
The time Marty spend on his book report is:
60 minutes or 1 hour
It took Marty 42 minutes to write a book report then he spend 18 minutes correcting his report.
This means that the total time i.e. the overall time he spends on his book is:
Time he spend on writing the book+ The time he spend on correcting his book report
Hence,
Total time= 42 minutes+18 minutes
i.e.
Total Time= 60 minutes
Also, we know that:
1 hour= 60 minutes.
Hence, his total time is: 60 minutes or 1 hour.