Place Value - Mystery Numbers
1. This mystery number has 4 digits. Every digit is an odd number. None of the digits is a 9. Every digit in the number is different. The smallest digit is in the thousands place. The greatest digit is in the ones place. The preceding describes two possible numbers. The mystery number is the greater of those two numbers. What is the mystery number?
2. This mystery number has 5 digits. There is a 4 in the ten thousands place. None of the other digits is a 4. What is the smallest number that this mystery number can be?
3. This mystery number has 6 digits. If you add one to this number it will be a 7 digit number. What is the mystery number?
4. This mystery number is one half of a billion. How many zeros are in this number?
Rounding Riddles
1. I am a number. If you round the number of days in October to the nearest ten and round the number of days in February to the nearest ten, I am half of the product of those two numbers. What number am I?
2. I am an amount of N.Z. money. I am the cost of five $ .88 hamburgers rounded to the nearest dollar. How much money am I?
3. I am a number. I am the difference between 800 rounded to the nearest 10 and 800 rounded to the nearest 100. How much am I?
4. I am a number. I am the missing number from each of two of the equations below. I am also the sum of 237 and 240 rounded to the nearest 10. Which two equations do I complete?
a. 1,782 - 800 =
b. 8 X 60 =
c. 480 + 20 =
d. 5,322 - 4,842 =
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