$10 AND $20 that equal $90
1. 10x9=$90 so 9 10 dollar bills equals 90
2. 4x20=80 1x10= 10 so 4 twenty dollar bills and 1 10 dollar bill equals $90
3. 3x20=60 3x10= 30 so three twenty dollar bills and 3 ten dollar bills equals $90
4. 2x20=40 5x10=50 so two twenty dollar bills and 5 ten dollar bills equals $90
5. 1x20=20 7x10=70 so 1 twenty dollar bill and seven ten dollar bills equals $90
+1011 
