İf you write down all the numbers from 1 to 100, then how many times do you write 4?

[Dersnotu]

İf you write down all the numbers from 1 to 100, then how many times do you write 4?

[Dersnotu]

• 4,14,24,34 (4 units)
• 40,41,42,43,44,45,…,49 (11 units)
• 54,64,74,84,94 (5 units)

Total: 4 units+11 units+5 units=20 units

Answer: 20