No.
9 decimeters is 90 centimeters, so yes, it is greater than 86 centimeters.
Decimeters.
yes
No. There are 10 centimeters in each decimeter.
Less than.
Equal. Because 1 decimiter=10 centimeters. So 3 decimeters are 30 centimeters.
Equal to.
To compare 4.25 decimeters and 4.25 centimeters without converting, you can note that 1 decimeter is equal to 10 centimeters. Therefore, 4.25 decimeters is equal to 42.5 centimeters. Since 42.5 centimeters is greater than 4.25 centimeters, you can conclude that 4.25 decimeters is larger than 4.25 centimeters.
5 decimeters.
Both are equal. 1 decimeter=10 centimeter. Therefore, 5 decimeters=50 centimeters.
Same
Equal. Because 1 decimiter=10 centimeters. So 3 decimeters are 30 centimeters.