# Natural numbers + multiplication principle - math problems

#### Number of problems found: 38 There are 4 roads from city A to city B. There are 5 roads from city B to city C. How many different routes can we come from city A to city C via city B?
• Number 4 Kamila wrote all natural numbers from 1 to 400 inclusive. How many times did she write the number 4?
• Wedding guests Fifteen wedding guests could not agree on who would stand in the wedding photo. The groom suggested that all possible sets of wedding guests be made in the photographs.
• 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
• You have You have 4 reindeer and you want to have 3 fly your sleigh. You always have your reindeer fly in a single-file line. How many different ways can you arrange your reindeer?
• How many 4 How many 4 digit numbers that are divisible by 10 can be formed from the numbers 3, 5, 7, 8, 9, 0 such that no number repeats?
• Tournament How many matches will be played in a football tournament in which there are two groups of 5 teams if one match is played in groups with each other and the group winners play a match for the overall winner of the tournament?
• Research in school For particular research in high school, four pupils are to be selected from a class with 30 pupils. Calculate the number of all possible results of the select and further calculate the number of all possible results, if it depends on the order in which th
• Three-digit numbers We have digits 0,1,4,7 that cannot be repeated. How many three-digit numbers can we write from them? You can help by listing all the numbers.
• Divide How many different ways can three people divide 7 pears and 5 apples?
• Twenty-five How many three-digit natural numbers are divisible by 25?
• Cube construction A 2×2×2 cube is to be constructed using 4 white and 4 black unit cube. How many different cubes can be constructed in this way? ( Two cubes are not different if one can be obtained by rotating the other. )
• Boys and girls There are 20 boys and 10 girls in the class. How many different dance pairs can we make of them? There are 15 boys and 12 girls at the graduation party. Determine how many four couples can be selected.
• Telephone numbers How many 7-digit telephone numbers can we put together so that each number consists of different digits?
• Digits How many odd four-digit numbers can we create from digits: 0, 3,5,6,7?
• Bookshelf and books How many ways can we place 7 books in a bookshelf?
• Three-digit integers How many three-digit natural numbers exist that do not contain zero and are divisible by five?
• Each with each Five pupils from 3A class played table tennis. How many matches did they play with each other?
• Inverted nine In the hotel,, Inverted nine" each hotel room number is divisible by 6. How many rooms we can count with three-digit number registered by digits 1,8,7,4,9?

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