The two conversions you need will be -
1 dm (decimeter) = 10 cm (centimeter)
1 cm (centimeter) = 10 mm (millimeter)
First, we will convert 2.99 dm to cm.
2.99 dm x 10 cm/dm = 29.9 cm
Now, we will convert 29.9 cm to mm.
29.9 cm x 10 mm/cm = 299 mm
So, 2.99 dm = 299 mm
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2.99 decimeters is equal to 299 millimeters. This is because there are 10 millimeters in 1 decimeter.
299 millimeters = 11.77 inches.
990 millimeters is 9.9 decimeters.
100, you move the decimal places to the right two.
300 millimeters is equal to 30 decimeters. This is because there are 10 millimeters in one decimeter.
There are 70 meters in 7000 decimeters (dm) because 1 dm is equivalent to 0.1 meters. So, you simply multiply 7000 dm by 0.1 m/dm to get 700 m.