Time: Adding Weeks and Days

Hello,

In our last post, we learned about the number of days in each month and how to convert from weeks to days and days to weeks.  In our post today, we are going to learn how to add days and weeks together.

Let's review: 1 week = how many days? If you are thinking 7, you are correct!
Let's go over the rules for days and weeks addition:

1.) Add your days together.
2.) Add your weeks together.
3.) If your days add up to 7 or greater, you will subtract 7 from your days, and then increase your weeks by 1.
4.) If the amount of days is still 7 or greater, then you will repeat step 3. 


Remember that step 3 is the key!

Let's try some examples: Add the following weeks and days.

1.) 2 weeks, 6 days + 3 weeks, 2 days = ?
2.) 1 weeks, 4 days + 9 weeks, 1 day = ?
3.) 7 weeks, 5 days + 4 weeks, 7 days = ?
4.) 3 weeks, 8 days + 8 weeks, 3 days = ?
5.) 6 weeks, 14 days + 2 weeks, 2 days = ?

Solutions:

1.) Add the weeks together first, and then the days together.  2 weeks + 3 weeks = 5 weeks; 6 days + 2 days = 8 days.  Since your number of days is greater than or equal to 7, you're going to subtract 7 from your amount of days (8-7 = 1) and then add 1 to your weeks (5 + 1 = 6).  So, you're final answer is 6 weeks and 1 day.

2.) 1 week + 9 weeks = 10 weeks; 4 days + 1 day = 5 days; so, since your amount of days is less than or equal to 7, you can stop right there, and you're done.  So, you're final answer is 10 weeks and 5 days.

3.) 7 weeks + 4 weeks = 11 weeks; 5 days + 7 days = 12 days; so, here since we have 12, we must subtract 12-7 days = 5 days.  Then, we must add 1 to our 11 weeks = 12 weeks.  So, our final answer is 12 weeks and 5 days.

4.) 3 weeks + 8 weeks = 11 weeks; 8 days + 3 days = 11 days; so, we must subtract 11 days - 7 = 4 days, and then we must add 1 to our 11 weeks = 12 weeks.  So, our final answer is 12 weeks and 4 days.

5.) 6 weeks + 2 weeks = 8 weeks; 14 days + 2 day = 16 days; we must subtract 16 days - 7 = 9 days, and then add 1 to our 8 weeks = 9 weeks.  We must continue because 9 days is still greater than 7.  So, we take 9 days - 7 = 2 days, and then add 1 to our 9 weeks = 10 weeks.  So, our final answer is 10 weeks and 2 days.

The first link below reiterates how to add weeks and days; it has a practice at the bottom of the webpage; the second link is more for fun--you can add and subtract weeks and days from a certain date.  This is useful if you do not have a calendar around to find the date, and it takes less time.

1.) Explanation of how to add weeks and days with an example
2.) Adding and Subtracting weeks and days to a date calendar

I hope this helps!