Maths practice for 12-year-olds - page 238 of 307
Number of problems found: 6129
- Parenthesis: 4144
Solve a simple equation with a minus before the parenthesis: 4x- (x-4) = 5-3x - Summands
Find two summands of the number 42 so that its product is minimized. - Installation 4123
The team of installers is to carry out the installation in 20 days. By adding two fitters from the beginning of the work, the assembly was completed in 15 days. How many were on the team? - Fraction 4114
Express the fraction and decimal number of which part of the meter is: 120mm, 25cm, 7dm, 670mm, 48cm, 9.7dm.
- Cruise liner
The cruise liner runs along the river between points A and B. The journey downstream takes 40 minutes and 1 hour upriver. The flow rate of the river is 3 km/h. What is the speed of a cruise liner? - Pumps
Five pumps pumped 1,800 hl of water for 3 hours. How many hectoliters of water did the same two powerful pumps pump for six hours? - Girlfriends 4107
Four girlfriends want to take a photo together. How many different ways can they stand side by side? - Cuboid surface
Determine the surface area of the cuboid if its volume is 52.8 cm cubic and the length of the two edges are 2 cm and 6 cm. - Cuboid - Vab
Find the surface of the cuboid when its volume is 52.8 cubic centimeters and the length of its two edges is 2 centimeters and 6 centimeters.
- Equation
Find x: x + 1/2 = 1/3 - Calculate 4089
Calculate and perform the test. 3a / 2 + 5/6 = a / 3 - 3/2 - Surface of wall
Find by what percentage the cube's surface will decrease if we reduce the surface of each of its walls by 12%. - Unknown number
I think the number - its sixth is three smaller than its third. - Diameter 4078
What is the diameter of the wheel when it turns 455 times per 1 km? They rounded to the nearest cm.
- Simple equation
Solve for x: 3(x + 2) = x - 18 - Efficiency 4073
Determine the efficiency of a vacuum cleaner with a power input of 1.2 kW when the suction power is 360 W. - Speed reader
Petr reads 12 pages of the book in 1 hour. Express a fraction of what part of the book it will read in 5 hours if it has 280 pages. - Efficiency
What is the power output of a kettle 2 kW with an efficiency of 90%? - Two-quarters 4068
The theatrical performance began at 7:30 PM and lasted two-quarters of an hour with one 20-minute break. What time did the show end?
Twenty students will plant 1,200 trees in 4 hours. How many students do you need to plant 2100 trees in 3 hours at the same performance?Do you have homework that you need help solving? Ask a question, and we will try to solve it. Solving math problems.
