Maths practice for 12-year-olds - page 41 of 350

Number of problems found: 6997

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.
Meat 5
2.4 kg of meat costs 292 CZK in the store. How much meat of the same type can I buy here for 2482 CZK?
Path 11
A path 1.5 meters wide is to be built around the perimeter of a square plot of land with a side of 28 meters. By how much will the area of the plot be reduced?
Solve R
Solve the equation with brackets: 5×(2u-9)-8×(0.5-3u)=4×(7u-1)-3
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.

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