Page 26 - NUMINO Challenge_C2
P. 26
3 Jane’s computer is protected by a 4-digit password. The first two
numbers of the password are equal to the number of 7’s in the
numbers from 1 to 77. The last two numbers of the password is equal
to the number of 3’s in the numbers from 1 to 77. Find the password
to unlock Jane’s computer.
PASSWORD:
4 The numbers from 1 to 900 are listed as shown below. Which digit is
used the least? How many times is it used?
1 2 3 4 5 6 7 8 9 10 11 12 13
23Number and Operations
numbers of the password are equal to the number of 7’s in the
numbers from 1 to 77. The last two numbers of the password is equal
to the number of 3’s in the numbers from 1 to 77. Find the password
to unlock Jane’s computer.
PASSWORD:
4 The numbers from 1 to 900 are listed as shown below. Which digit is
used the least? How many times is it used?
1 2 3 4 5 6 7 8 9 10 11 12 13
23Number and Operations
