Mastering Time Addition and Subtraction with Regrouping

This video tutorial explains how to add and subtract time using regrouping. It covers examples of adding hours and minutes, and how to handle situations where minutes exceed 60, requiring conversion to hours. The tutorial also demonstrates subtraction with regrouping, including complex examples that involve both time and base-10 regrouping.

What is the first step in adding the times 5 hours and 45 minutes and 7 hours and 50 minutes?

• Add the hours first

• Add the minutes first

• Subtract the minutes first

• Subtract the hours first

When adding 5 hours and 45 minutes to 7 hours and 50 minutes, what do you do if the total minutes exceed 60?

• Add the extra minutes to the next hour

• Convert the extra minutes to hours

• Ignore the extra minutes

• Subtract the extra minutes

If Mark drives to visit his cousin, it takes 10 hours and 15 minutes. If he flies, it takes 2 hours and 40 minutes. How much longer does it take to drive?

• 7 hours and 35 minutes

• 8 hours and 25 minutes

• 6 hours and 45 minutes

• 7 hours and 55 minutes

In a subtraction problem, if the minutes in the minuend are less than the minutes in the subtrahend, what should you do?

• Subtract the hours first

• Regroup by converting an hour to 60 minutes

• Ignore the minutes

• Add 60 minutes to the minuend

When regrouping in subtraction, what does taking away one hour from the hours place value add to the minutes place value?

• 10 minutes

• 30 minutes

• 45 minutes

• 60 minutes

Marta has a conference room for 20 hours and 30 minutes. She has already used 1 hour and 52 minutes. How much time does she have left?

• 19 hours and 48 minutes

• 18 hours and 38 minutes

• 19 hours and 38 minutes

• 18 hours and 48 minutes

In the second subtraction problem, what is the first step after setting up the problem?

• Regroup the hours

• Regroup the minutes

• Subtract the minutes first

• Subtract the hours first

What is the result of subtracting 1 hour and 52 minutes from 2 hours and 30 minutes?

• 1 hour and 48 minutes

• 1 hour and 38 minutes

• 38 minutes

• 2 hours and 38 minutes

When regrouping in base 10, what does taking away one from the tens place add to the ones place?

• 20 ones

• 15 ones

• 10 ones

• 5 ones

In the context of time subtraction, what does regrouping typically involve?

• Converting seconds to minutes

• Converting hours to minutes

• Converting minutes to hours

• Converting days to hours