Math practice for 13 year olds - page 100 of 422

Number of problems found: 8423

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.
Probability 73654
We roll two dice. One is 6-walled, and the other is 8-walled. What is the probability that at least one unit will fall?
Work space
Every person in a conference room must have at least 36 square feet of workspace. A conference room is 28 by 20 ft. find the maximum number of people the room can accommodate.
Angela 2
Angela received 50 rupees as pocket money and spent 2/5 of her money. How much money does she have left?
Selling eggs
Mandy bought 24 trays of eggs. The tray contains 30 pieces. Each tray costs P130.00. He sold per piece for P8.00. But since 12 pieces are tiny, he decided to sell them for P7.00 only. Assume that Mandy incurred the operating expenses of P800.00 and an int
Square-shaped 73564
The map shows a square-shaped field with a side length of 0.7 cm. Its area is 49 ha. Find the scale of the map.
Rectangular 73554
The family house has a rectangular shape with sides of 15m and 12m. Determine the lengths of the sides of a family house on a drawing with a scale of 1:250

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