Daily Post: Jan 5
Level
1
You have 10 seconds to answer this question:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = ?
Hint: Group the numbers together.
55
60
65
50
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1 solution
Here is the solution:
A. Group most of the numbers together so that each group sums up to 10:
1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
4 + 6 = 10
10 = 10
5 = 5
B. Add up the 10s and the 5 to get the answer:
10 + 10 + 10 + 10 + 10 + 5
= (10 x 5) + 5
= 50 + 5
= 55