Groups of change with totals from 1 to 100 cents using the least amount of coins.

Illustration of 28 congruent cubes placed in the shape of a square. A 3-dimensional representation on…

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

An isosceles triangle with angles 124, 28, 28

An isosceles triangle with angles 28, 76, 76