Siya writes 1 on the first step, 2 on the second, and so on to 10. What is the total of all ten numbers?
A little nudge?
Pair the first step with the last.
Ready for the answer?
55
There are five pairs that each total 11: 1 + 10, 2 + 9, 3 + 8, 4 + 7, and 5 + 6. Five times 11 is 55.