Page 99 - NUMINO Challenge_M1
P. 99
Creative Thinking
A building has floors that are numbered 1, 2, 3, 5, ..., 13, 15, ...,
39, 50, 51, ... and it does not have the digit 4 in any floors. If the
highest number in the elevator is 63, how many floors does the
building have?
Key Point
Find the number of
numbers from 1 to 63
that do not have the
digit 4.
The table shows the math test scores for Hank and his friends.
The scores are written from the highest to the lowest. Find the
greatest possible test score that Mark can recieve.
Name Hank Mark Carl
Math test score
76 8 4
Key Point
If Mark’s test score is
78, it would be
greater than Hank’s,
so Mark’s score must
be less than 78.
96 NUMINO Challenge M1
A building has floors that are numbered 1, 2, 3, 5, ..., 13, 15, ...,
39, 50, 51, ... and it does not have the digit 4 in any floors. If the
highest number in the elevator is 63, how many floors does the
building have?
Key Point
Find the number of
numbers from 1 to 63
that do not have the
digit 4.
The table shows the math test scores for Hank and his friends.
The scores are written from the highest to the lowest. Find the
greatest possible test score that Mark can recieve.
Name Hank Mark Carl
Math test score
76 8 4
Key Point
If Mark’s test score is
78, it would be
greater than Hank’s,
so Mark’s score must
be less than 78.
96 NUMINO Challenge M1
