An Advanced Shortcut
Eva was 8 years and 7
months at the time that this video was made.
The Problem
You have 29 gumdrops and I have 27 gumdrops. How many gumdrops
do we have altogether?
What To Look For In This Video
- Instead of adding 29 + 27 Eva adds 30 + 30 and then subtracts 4.
- 29 = 30 - 1
- 27 = 30 - 3
- 29 + 27 = (30 - 1) + (30 - 3) = (30 + 30) - (1 + 3) = 60 - 4 = 56