subtraction
10 - 3
7
15+4
19
it has 0 corners
circle
500+30+1
531
this coin has a copper color
penny
25-13
12
22+24
46
it has 4 sides that are equal
square
400+30+2
432
this coin is worth 5 cents
nickel
39-17
22
36+30
66
it has 2 pairs of sides of equal length
rectangle
5000+300+60+9
5369
this coin is worth 10 cents
dime
84-37
47
45+45
90
it has 3 corners
triangle
2000+30+2
2032
this coin is worth 25 cents
quarter
98-59
39
45+55
100
it has 5 sides and 5 corners
pyramid
3000+1+50+200
3251
this coin is worth 50 cents
half dollar