2. Apples are ___% water, while cantaloupes are ___% water. Each number is between 9 and 100. Both are even numbers. Both number have the same digit in the ones place, but not in the tens place. Each of the fruits is more than half water. Apples are not a multiple of 10. Cantaloupes are 10% more water than apples. Only the smaller number has 100% of the digits even. Each contains a digit greater than half a dozen and a digit less than the number of sides on a pentagon. Each of the numbers has the sum of the digits greater than 10.

3. The average man’s heart beats ___ times per minute, while the average woman’s heart beats ___ times per minute. A woman’s heart beats more times per minute than a man’s. Both are even numbers. Both contain the same digit in the tens place. The sum of the two numbers is between 75 and 175. Neither number is greater than 99. Neither have 100% of the digits even. One contains two digits greater than 5, while the other does not. Neither number is a multiple of 10. Both are multiples of 3.

4. The fastest bird can fly ___ miles per hour, while the fastest ocean swimmer can go ___ miles per hour. Each number is more than 50 Each number is even Each number is less than 260 The bird is almost three times faster than the sailfish Only the larger number is a multiple of 5 No odd digits are contained in either number 4 of the 5 digits needed to write the numbers are different from each other One number is a multiple of 100 The different of the two numbers is 132

5. The human head will be nearly full size when a person is about ____ years old, while the human brain stops growing in size when a person is ___ years old. Both numbers are less than 64 The age for the brain to stop growing is more than for the head to stop growing. Only one is an odd number. Both are multiples of 5 Neither contain a digit larger than 5 The difference between the two numbers is less than 10 Neither number is less than 10 Only the larger number is a multiple of 3 The two numbers have one digit in common

6. There are ___ bones in the skull of an adult human, while there are ___ bones totally in the arms of an adult human (hands included). Both numbers are two-digit numbers. Both are even numbers. One number is more than 50 and one is less than 50 Only one is palindromic. The sum of the two numbers is less than 100 The larger number is the number of bones in the arms. Three different even digits are used to write the two numbers. Neither number is a multiple of 10 The larger number is a multiple of 8

7. A person weighing 100 pounds on Earth would have a different weight on other planets due to the force of gravity. On Mars that person would weigh ___ pounds, while on Venus that person would weigh ____ pounds. Both numbers are less than 100 Neither number is a multiple of 5 The weight on Venus would be more than Mars. Both numbers are two-digit Both numbers contain a common digit but not in the same place value position. One number is more than 9 squared. One of the Mars digits is one third of one of the Venus digits. Only the smaller number is even. The sum of the digits in each number is prime.

8. The United States accounts for about ___% of the world’s population and consumes about ___% of the world’s resources. Both numbers are less than one half of 100 Neither number is even Only the larger number is a composite number Only one of the numbers is a two-digit number Both numbers share a common factor (besides 1) Both numbers have a digit in common Neither number contains digits greater than half a dozen Only one of the three digits needed to write the numbers is even. The population number is one fifth of the resource number.

9. The average lifespan for a giraffe is ___ years, while the average shark lives ___ years. Each number is less than 150 Only one number is even. Both numbers are multiples of 5 The shark number is more than three times that of the giraffe. Neither number has 100% even digits or 100% odd digits. Each number is greater than 4 squared The smaller number, the giraffe, is an odd number. The larger number contains a repeated digit. Both numbers are square numbers.

10. Milk chocolate, such as a Hershey bar, is ___% water, while bananas are ___% water. Only one is more than 50 Only one is even. Only one is a square number. The digits used to write the two numbers are made with straight lines only. The banana number is more than ten times the chocolate. Two of the three digits used to write the numbers are odd. Each of the numbers contains a digit that is by itself considered a square number. Neither number contains the largest or smallest digit in our number system. The larger number is not odd.

11. A human infant has ___ bones in its body, while an adult human being has ___ bones. Both are three-digit numbers less than 500 Only the larger number is a multiple of 10 The infant number is larger than the adult The product of the digits in each number is zero Both numbers contain the same digit in the tens place 50% of the digits needed to write the numbers are the same The hundred’s place digit of the larger number is one more than the digit in the hundred’s place of the smaller number. The smaller number has no odd digits The largest digit in each number is a multiple of three

12. The average Olympic athlete consumes ___ calories a day, while the recommended average daily caloric intake is ___ for an adult. Both are four-digit numbers. Both are even Neither is more than 8000 Both are multiples of 100 Only the smaller number is a multiple of 1000 The Olympic athlete’s number is more than twice the recommended adult average The larger number contains 50% odd digits, while the smaller number has no odd digits Only three different digits are used to write the two numbers The digit for the number of days in a week does not appear in either number.