The longest land route is 15,150 km between Talon (Russia) and Sagres (Portugal). The longest highway in Africa is 10,228 km long, connecting the cities of Cairo, in Egypt and Cape Town, in South Africa. How much longer is the land route between Talon and Sagres compared to the highway between Cairo and Cape Town?
Given:
- Land route (Talon to Sagres) = 15,150 km
- Highway (Cairo to Cape Town) = 10,228 km
Formula: Difference = Longer route - Shorter route
Substitution: Difference = 15,150 - 10,228
Calculation: Ones: 10 - 8 = 2 Tens: 4 - 2 = 2 Hundreds: 11 - 2 = 9 (after borrowing) Thousands: 4 - 0 = 4 (after borrowing) Ten-thousands: 1 - 1 = 0
Answer: The land route between Talon and Sagres is 4,922 km longer than the highway between Cairo and Cape Town.
Explanation
The chapter shows subtraction of 5-digit numbers. 15,150 - 10,228: Ones: 10-8=2, Tens: 4-2=2, Hundreds: 11-2=9 (after borrowing), Thousands: 4-0=4 (after borrowing), Ten-thousands: 0. Answer: 4,922 km.
Solution Steps
Step 1: Set up subtraction: 15,150 - 10,228
Step 2: Ones: 0 - 8 cannot be done. Borrow: 15,150 becomes 15,14(10). 10 - 8 = 2
Step 3: Tens: 4 - 2 = 2
Step 4: Hundreds: 11 - 2 = 9 (after borrowing from thousands)
Step 5: Thousands: 4 - 0 = 4 (after borrowing)
Step 6: Ten-thousands: 1 - 1 = 0
Step 7: Answer: 4,922 km