# Natural numbers - 9th grade (14y) - math problems

#### Number of problems found: 211

• Children and horses There are some children and horses in a field.  Together they have 39 heads and 122 feet. How many children are in the field and how many horses are in the field?
• Perfect cube Which of the following number is not a perfect cube? a. 64 b. 729 c. 800 d. 1331
• Two numbers One number is by 79 larger than the other. If we divide the larger number by the smaller one, we get the ratio 5 and the remainder 11. Determine both numbers.
• The sum 16 The sum of A and B is 36. The difference between A & B is 8. find the larger number of A.
• Comparing exponents A) 8 (6²)(8²) b) 16 (6²)(8²) c) (6¹+²) (8²)
• The sum 13 The sum of the exponents of the prime factors in the prime factorization of 196 is. .. .
• Three unknown numbers The sum of of three numbers is 106. the first number is 10 more then the third. The second number is 2x the third. What are the numbers?
• The ratio 3 The ratio of male pupils to female pupils in Gymnasium is 7:9. If there are 512 pupils, how many pupils are male?
• Boys and girls 8 In a class of 35 boys and girls that has a ratio of 2:5, 5 boys are absent and 5 boys are present. How many students are present?
• Boys and girls If the ratio of male & female teachers is 2/5 & it is in proportion of the male & female students, how many are girls if there are 42 boys?
• Boats 2 Three quarters of the boats in the marina are white 4/7 of the remaining boats are blue, rest are red if there are 9 red boats. How many boats are in the marina?
• The sum 8 The sum of two numbers is 21. If three times the smaller numbers is two less than twice the larger number, find the two numbers.
• Special sequence What if            2×9=1            3×9=2            4×9=3            5×9=4            6×9=5            7×9=6            8×9=7            9×9=8           10×9=9    then 1×9=??? answer with solutions. .. ..
• Petra's test The answer will be given 8 marks, and the wrong answer will be deducted 3 marks. The total number of marks obtained by the school is 36. If Petra answered six questions correctly,   how many questions were answered incorrectly by the student from the scho
• Sean Junkins Sean Junkins works at X-Mobile. His pay is easily calculated by using the expression 12h+8c, where h is the number of hours he works and c represents the amount of phones he sells.  Would Sean Junkins make more money if worked 37 hours and sold 3 cell pho
• Right key The hostel has 4 rooms. The keys to each room are not numbered. Each of the four guests took one key. What is the probability that everyone took the right key? If there are 3 roads from town A to town B And 4 roads from town B to town C, in how many ways can one go from town A to town C and back to town A, through town B, without passing through the same road twice?
• Hockey Championships At the 2021 World Hockey Championships, there are eight teams in Group A, each of which plays seven matches. There are 4 points for each team to gain points (3-2-1-0), but it is always paired with the opponent's points ( 0-1-2-3). How many points are ther
• A box A box contains 6 red balls, 5 blue, and 4 white balls. Find the probability of drawing a) red ball b) non-white ball.
• Committee 2 How many committee consisting of 3 women and 2 men can be formed from a group of 6 woman and 5 men?

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Natural numbers - math problems. Examples for 9th grade.