sara wants to know how many boxes of cookies her entire girl scout troop sold. How could she use compatible numbers to find the sum?

kate 52 boxes
sara 43 boxes
jen 18 boxes
haliey 27 boxes

50 + 40 + 20 + 30 = ?

Then >> 2 + 3 - 2 - 3 = ?

1. 140

2.0

To find the sum, Sara can use compatible numbers, which are numbers that are easy to work with mentally. Here's how she can use compatible numbers to find the sum of the boxes of cookies sold by her entire Girl Scout troop:

1. Group the numbers into pairs that are easy to add mentally. In this case, the pairs could be:
- Kate and Sara: 52 + 43
- Jen and Haliey: 18 + 27

2. Add the pair of numbers together. In this case, the sums would be:
- Kate and Sara: 52 + 43 = 95
- Jen and Haliey: 18 + 27 = 45

3. Now, add the two sums together to get the total number of boxes sold:
- Total: 95 + 45 = 140

Therefore, the entire Girl Scout troop sold a total of 140 boxes of cookies.