Cindy had 40 balloons.
15 of the balloons burst and she gave away
78 of the good balloons. How many balloons did she have left?
|
Good balloons |
Burst balloons |
Total balloons |
Comparing good and burst balloons at first |
4x2 = 8 u
|
1x2 = 2 u
|
5x2 = 10 u
|
Before |
8 u |
2 u |
|
Change |
- 7 u |
|
|
After |
1 u |
2 u |
|
The number of good balloons is repeated. Make the number of good balloons the same. LCM of 4 and 8 is 8.
Total number of balloons at first = 10 u
1 u = 40 ÷ 10 = 4
Number of balloons that Cindy had left
= 1 u
= 4
Answer(s): 4