3) Agatha is trying to find pairs of number that will sum up to a multiple of 11. From the numbers in the grid below, help Agatha find these pairs of numbers.
3 | 8 | 52 | 36 | 69 | 74| 14 | 20 | 47
a) How many pairs of number did you find? What are these? Explain your strategy.

b) Did you find any number that has no partner?

c) Did you find any number that could have more than one partner?

d) What do you think is special about these pairs of numbers? Did you find any pattern? Explain your answer.​