Final answer:
To subtract 5 hm 9 mm from 10 km, convert the quantities to the same unit (hm) and subtract. The difference is 99.99991 hm.
Step-by-step explanation:
To subtract the given quantities, we need to ensure that they have the same unit. Since 1 kilometer (km) = 10 hectometers (hm), we can convert 10 km to hm by multiplying it by 10. So, 10 km = 10 × 10 hm = 100 hm.
Now, we can subtract 5 hm 9 mm from 100 hm. Since we have millimeters (mm) and hectometers (hm), we need to convert mm to hm. Since 1 mm = 0.00001 hm, we can convert 9 mm to hm by multiplying it by 0.00001. So, 9 mm = 9 × 0.00001 hm = 0.00009 hm.
Subtracting 0.00009 hm from 100 hm, we get 99.99991 hm. Therefore, the difference between 10 km and 5 hm 9 mm is 99.99991 hm.
Learn more about Subtraction