Maths practice for 12-year-olds - page 41 of 351

Number of problems found: 7018

Mary read
Mary read 2/9 books in the morning and 5/9 in the evening. What fraction of books has she read?
What number
What number must be added to both the numerator and denominator of 3/5 to get 5/6?
Electronic price decrease
Each year a store decreased the price of a specific TV model by $35. If the price in 2001 was $1,950, what was the price in 2009?
Five times
Five times a number divided by three is ten. What is the number? a.5 b.6 c.7 d.8
The volume 7
The volume of a cylindrical can is 75.36 in³. The diameter is 4 inches. Find the height. Use 3.14 as an estimation for pi.
Whole part
35/16 = 2.1875. What is the whole number of this decimal?
A mixed school
In a mixed school, 5/9 of the pupils are boys. If there are 128 girls, how many pupils are there altogether?
A decimal
A decimal rounded to 2 decimal places is 5.32. This decimal has 3 decimal places. What is the greatest possible decimal?
Iron ball 2
What is the mass of the iron ball with a diameter of 1,0 dm? The density of iron is 7870 kg/m³. .
Rita bought
Rita bought a school shirt for $16.99, a pair of white gym shorts for $12.95, and a white T-shirt for $9.90. She turned in a voucher for $8.75. If she pays her bill with two 20 - dollar notes, what change did she receive?
The miniature
The miniature golf scores for 7 friends are 23, 30, 39, 32, 35, 14, and 23. What is the mean golf score for this group of friends?
The special
The special mix contains 5/6 pounds of dried chicken, 2/3 pounds of dried bison, and 1/2 pounds of dried vegetables. How many pounds of the special mix does Max get? Explain how you found your answer.
Quarter of some number
A quarter of an unknown number increased by one hundred is fifty. What is the unknown number?
Triangle ABP
An isosceles trapezoid ABCD is given. The length of side AB is 10 cm, the length of CD is 7 cm, and the height to side AB is 4 cm. Point P is the base of the altitude to side AD. Calculate the area of the triangle ABP.
Salad - delicacy
The customer paid € 1.50 for 300g of salad. How much € will he pay for 500 g of salad?
Measuring cylinder
A measuring cylinder has a base radius of 35mm and a height of 500mm. Calculate the surface area wetted by the liquid if the level reaches a height of 35cm.
Calculate 423
Calculate the volume and surface area of a cylinder if its height is 40 dm and the diameter of the base is 3 m.
A fraction of an hour
Calculate in minutes: 2/3 of 5 hours.
In the kitchen 2
In a kitchen measuring three by two meters, we want to lay square tiles with sides of 20 cm on the floor. If there are exactly 40 tiles in one package, how many such packages do we need to buy to cover the entire kitchen? (We place the tiles right next to
Running race
The running race consists of two stages. Two-thirds of the competitors completed the first stage, and only three-quarters of them completed the second stage. Only 12 competitors reached the finish line. Determine how many competitors were at the start and

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