Four students provide the following approximations for 0.89.
anyah states that _0.89 is between 0.44 and 0.45 because 0.44< < 0.45.
matthew states that v0.89 is between 0 and 1 because i < 0.89 < 1.
rhoda states that 0.89 is between 0.9 and 1.0 because 0.92 0.89 < 1.02.
ming states that v0.89 is between 0.93 and 0.95 because (0.93)2 < 0.89 < (0.95)2.

So he made 18 muffins for each of his friends and he has none left

so it can be divided by :

2 friends18/2 = 9...each getting 9 muffins
3 friends18/3 = 6...each getting 6 muffins
6 friends18/6 = 3...each getting 3 muffins
9 friends18/9 = 2...each getting 2 muffins
18 friends...18/1 = 18...each getting 1 muffin