Math practice for 13 year olds - page 100 of 421

Number of problems found: 8409

A six-sided
A six-sided die is rolled once. What is the probability that the number rolled is an even number greater than two?
Ratios equation
Find the number x so that: 1:x=4:100
Play the flute
There are 100 members 12 play the flute. What % that plays the flute?
Spirulina 74164
Spirulina seaweed contains 55% protein per 100 grams, i.e., 55 grams of protein. How many grams of protein are in 200 grams of spirulina?
Three trucks
There are places A and Y, three trucks, B, C, and D, respectively. Truck B is 60 km/h, C is 40 km/h and D is 80 km/h. Trucks B and C start at place A while D starts at Y. After D and B meet, two hours later, will D meet C. What is the distance between pla
Two teacher 2
Two teachers are paid 5100 USD together. If the teachers are to share this amount in the ratio of 3:7, how much does each receive?
Mackie's
Mackie's income varies directly from the number of days that she works. If she earns 8000 pesos in 20 days, how much will she earn if she works three times as long?
Significant figures
How many significant figures are present in each of the measured quantities? A. 0.0012 B. 900.0 C. 108 D. .0012 E. 2006 F. 0.002070
Preparation 73954
Ivana was preparing for Testing 9. On the first day, she calculated a quarter of all calculated tasks; on the second day, a sixth; on the third, a fifth; on the fourth, only an eighth; and on the last day, she solved 31 tasks. How many tasks did she recal
Amanda
Amanda borrowed $5000 from two sources: her parents and a credit union. Her parents charged 3% simple interest, and the credit union charged 6% simple interest. After one year, Amanda paid $225 in interest. Thus, Amanda borrowed $5000 from both her parent
The distribution
The distribution of an office payroll of a certain company was as follows: 1/9 for technical assistants; 1/6 for executives; 2/15 for the accounting force and The rest is for the general clerical service. How much was allotted to each group if the total p
A hairstylist
A hairstylist schedules 1/4 hour to trim a customer's hair and 1/6 hour to style the customer's hair. The hairstylist plans to work 2 1/3 hours daily for five days weekly. How many appointments can the hairstylist schedule weekly if each customer must be
A sphere
A sphere has a radius of 5.5 cm. Determine its volume and surface area. A frustum of the sphere is formed by two parallel planes. One through the diameter of the curved surface of the frustum is to be of the surface area of the sphere. Find the height and
The number 6
The number of pizza slices Gilbert ate is four more than three times the amount of candy bars he ate. He ate ten slices of pizza. How many candy bars did he eat?
The sum 22
The sum of three consecutive whole numbers is 27. Find the numbers by showing all the steps.
Jabu had
Jabu had a few marbles. Today, he played and doubled his number. Then Thabo gave him three marbles for free. Jabu now has 21 marbles. How many did he have before he started playing? Solve this problem using a suitable model.
Tomorrow
Tomorrow is athletics day at school. Mom makes double the number of sandwiches that she usually makes. Then she adds four sandwiches so that Jabu and Thabo can each get six sandwiches. How many does she usually make?
Difference 73754
The difference between two positive integers is 25. One number is 59. What is the other number?
3S pyramid
A vertical regular 3-sided pyramid is given. The side of the base a = 5 cm, and the height is 8 cm. Calculate the volume and area.
Isosceles right triangle
If the square of the hypotenuse of an isosceles right triangle is 128 cm², find the length of each side.

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