ID 685

Numbers and Arithmetic K9Which gives the largest answer?



ID 688

Numbers and Arithmetic K9Which gives the largest answer?



ID 756

Numbers and Arithmetic K9Which gives the smallest answer?



ID 766

Numbers and Arithmetic K9What is 111% of a number, if 132 is 11% of that number?



ID 1020

Numbers and Arithmetic K9How many 2-digit integers are there in which the sum of the digits is equal to 6?



ID 1070

Numbers and Arithmetic K9If 120 is divided into three parts proportional to 7, 8 and 9, then the largest number is



ID 1207

Numbers and Arithmetic K9Evaluate:

1000000012 – 999999992



ID 1212

Numbers and Arithmetic K9How many digits are in the product of

2101 and 599?



ID 1554

Numbers and Arithmetic K9If you write all of the whole numbers from 1 through 1000, how many numbers have the digit 4?



ID 1839

Numbers and Arithmetic K9How much is

0 - 1 + 10 - 100 + 1000 - . . . -1010+1011



ID 1881

Numbers and Arithmetic K9What is the difference between the sum of the first 2012 even positive numbers and the sum of the first 2012 odd positive numbers?



ID 1980

Numbers and Arithmetic K9A man is eating a pizza.
During the first day he eats a half of the pizza.
On the second day he eats 1/3 of the remaining part of the pizza.
The third day he eats 1/4 of what is left, and the fourth day he eats 1/5 of what still remains.

He then stops because the last piece was not fresh.

What fraction of the original pizza is still available?



ID 2028

Numbers and Arithmetic K9An abundant number is a positive integer whose factors (other than the number itself) have a sum greater than the number.

Which number is not abundant?



ID 2229

Numbers and Arithmetic K9When freezing, milk increases its volume by 1/15.

How will the frozen milk volume decrease when it melts?



ID 2268

Numbers and Arithmetic K9Work out the sum of all the integers below 100.



ID 2276

Numbers and Arithmetic K9A number is said to be perfect if it is equal to the sum of its divisors.

For example, 6 is a perfect number because 1 + 2 + 3 = 6 .

What is the largest 3-digit perfect number?



ID 2283

Numbers and Arithmetic K9A prime number is an integer number that has no positive divisors other than 1 and itself.

Which is not a prime number?



ID 3221

Numbers and Arithmetic K9If 168 is divided into three parts proportional to 7, 8 and 9, then the smallest number is



ID 3318

Numbers and Arithmetic K9The North American emergency telephone number is 911.
It is a prime number.

A prime number is an integer that has no positive divisors other than 1 and itself.

What is the next prime number?



ID 3356

Numbers and Arithmetic K9Sebastian achieved these scores in his exams.

Which was his worst result?



ID 3392

Numbers and Arithmetic K9Multiply all the digits of each license plate without using a calculator.

Find the plate with the smallest total.



ID 3412

Numbers and Arithmetic K9On this target, I scored exactly 90.

How many shots did I fire?



ID 3432

Numbers and Arithmetic K9How many 2-digit integers are there in which the sum of the digits is equal to 6?



ID 3537

Numbers and Arithmetic K9How many positive integer numbers are twice the sum of their digits?



ID 3649

Numbers and Arithmetic K9What is the smallest possible difference between two integer numbers that, when multiplied together, produce12345?



ID 3774

Numbers and Arithmetic K9How many of the three-digit integers are multiples of the first five positive integers?



ID 3779

Numbers and Arithmetic K9Fill in each empty place between the numbers with one of the symbols +, -, x or /, with each symbol used exactly once.
No parentheses are allowed.

What is the least possible absolute value of the result?



ID 3784

Numbers and Arithmetic K9Find the sum of the digits of the first 100 odd positive numbers:

1 + 3 + . . .



ID 3918

Numbers and Arithmetic K9Find the average of all positive integers divisible by 3 and smaller than 1000.



ID 3964

Numbers and Arithmetic K9Write natural numbers 1, 2, . . .100 in a row so that the difference between any two adjacent numbers is smaller than N.

Find the maximum possible N.



ID 4039

Numbers and Arithmetic K9In a class, 7 students walk to school, two fifths ride the bus, and 32% are dropped off by their parents.

What number is the largest?



ID 4040

Numbers and Arithmetic K9In a class, 7 students walk to school, two fifths ride the bus, and 32% are dropped off by their parents.

How many students ride the bus?



ID 4051

Numbers and Arithmetic K9How many digits are there in the largest positive integer, in which each digit is at least the sum of all the digits to its left?



ID 4182

Numbers and Arithmetic K9What is the smallest result that can be achieved?

AB6 + BC7

Different letters in the expression are replaced with different numbers from 0 to 9 and there are no leading zeros.

The question is typical for PISA Test.

PISA stands for Programme for International Student Assessment.



ID 4235

Numbers and Arithmetic K9If the sum of 999 positive integers is equal to 1000 what is their product?



ID 4297

Numbers and Arithmetic K9What gives the largest result?



ID 4376

Numbers and Arithmetic K9Which number could not be written as a sum of 3 consecutive numbers?



ID 4501

Numbers and Arithmetic K9Find the first of the four consecutive integer numbers if their sum is -66.



ID 4537

Numbers and Arithmetic K9January 1st, 2014 was a Wednesday.

How many Wednesdays occurred in 2014?

2014 was not a leap year.



ID 4648

Numbers and Arithmetic K9Divide 55 into two parts so that one will be 150 percent of the other.

What is the smallest number?



ID 4830

Numbers and Arithmetic K9The product of 33 positive integers is 33.

What is the sum of the numbers?



ID 4906

Numbers and Arithmetic K9Estimate the product of the digits of the number 7777777.



ID 4921

Numbers and Arithmetic K9Find the midpoint between the points one fifth and fifteen.



ID 4959

Numbers and Arithmetic K9100 is to 121 as 10 to . . .



ID 5006

Numbers and Arithmetic K9Use four 9's and any math signs to make 100.

How many sign '+' did you use?