Natural numbers - 8th grade (13y) - math problems
Number of problems found: 180
- Unknown numbers
The sum of two consecutive natural numbers and their triple is 92. Find these numbers.
- All pairs
Determine all pairs (m, n) of natural numbers for which is true: m s (n) = n s (m) = 70, where s (a) denotes the digit sum of the natural number a.
How many do three-digit natural numbers not have the number 7?
- Big numbers
How many natural numbers less than 10 to the sixth can be written in numbers: a) 9.8.7 b) 9.8.0
- AM of three numbers
The number 2010 can be written as the sum of 3 consecutive natural numbers. Determine the arithmetic mean of these numbers.
How many are three-digit natural numbers divisible by 25?
- Sum of seven
The sum of seven consecutive odd natural numbers is 119. Determine the smallest of them.
- Three-digit integers
How many three-digit natural numbers exist that do not contain zero and are divisible by five?
- Count of roots
How many solutions has equation x. y = 7757 with two unknowns on the set of natural numbers?
How many rectangles with area 8713 cm2 whose sides are natural numbers are?
- Two numbers 7
The sum of two consecutive even numbers is 30. Find the numbers.
- A three-digit numbers
Determine the total number of positive three-digit numbers that contain a digit 6.
- Telephone numbers
How many 7-digit telephone numbers can we put together so that each number consists of different digits?
- Odd numbers
The sum of four consecutive odd numbers is 1048. Find those numbers ...
- Unknown number 7
16% of the unknown number is by 21 less than unknown number itself. Determine the natural unknown number.
- Three-digit numbers
Use the numbers 4,5,8,9 to write all three-digit numbers without repetition. How many such numbers are there?
Solve algebrogram for sum of three numbers: BEK KEMR SOMR ________ HERCI
-12, 60, -300,1500 need next 2 numbers of pattern
- Even / odd numbers
a / Using variable n write two consecutive odd numbers. b / the sum of three consecutive odd numbers is 333. What are this numbers?
- Real estate
Residential house has three entrances numbered by odd numbers arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of this three numbers.
Natural numbers - math problems. Examples for 8th grade.