Maths practice for 12-year-olds - page 267 of 354

Number of problems found: 7071

Wagon unloading
Workers unload the wagon in 3 1/2 hours. How much will it land in 2 hours?
Rhombus sides
If you decrease the side of the rhombus by 30 mm, its circumference will be 70.8 mm. How long was the side of the original rhombus?
Rhombus
If we increase the rhombus side by 2.4 cm, its perimeter is 20 cm. How long was the side of the rhombus?
Circumference of a rhombus
If you enlarge the side of the diamond by 4 cm, its circumference will be 20 cm. How long was the side of the original diamond?
Square
Calculate the square's perimeter and area with a diagonal length of 30 cm.
Flu cases
There were 36 new cases of influenza at the school during the study week, which was 40 percent less than in the previous week. How many new flu cases have been reported in the last week?
Parallelogram ABCD
Calculate the area and perimeter of the ABCD parallelogram with side a = 2.7 m, height to side a - va = 0.8 m, and b = 1.9 m.
Three-digit code
The five cards with the numbers 1, 2, 3, 4, and 5 put together all three-digit odd numbers. How many are there?
Perimeter to area
Calculate the area of a circle with a perimeter of 15 meters.
Alloy composition
The handle is made of alloy. The alloy is in a ratio of 6 parts gold, three parts lead, and eight parts diamond. The handle weighs 24 kg. How much weight are gold and lead?
Common divisor
A. Find the largest natural number by which the numbers 54 and 72 can be divided (120, 60, and 42) B. Find the smallest natural number that can be divided by each of the numbers 36 and 48 (24,18 and 16)
Phone ringtones
The phone has a variety of ringtones. 1/3 are loaded from the manufacturer. 2/5 ringtones are melodies. Composed by the user in special programs and the remaining 12 ringtones are digital recordings. How many ringtones are there in total on the phone?
Cyclist overtaking
The cyclist leaves Prague at a speed of 24 km/h. An hour later, a car drives behind him at 60km/h. How far from Prague, and how long will the car overtake the cyclist?
Prism cubes
How many 2 cm prism cubes do we need to make a 6 cm cube out of them?
Reward division
Peter and Adam were rewarded with 300 CZK for cleaning the yard. They awarded the reward in a 3:2 ratio. How many CZK did each get?
Sugar production
Nine tons of sugar beet are needed to produce 1 ton of sugar. In 1996, 4,500,000 tons of sugar beet were harvested in our country. How many tons of sugar were obtained from it?
Pole length
The pole's base is 1/3 to the bottom of the pond, 1/4 is submerged, and one meter protrudes above the surface. How long does the stake have to be cut?
Job task
After two hours and 40 minutes, the job is finished. Compared to last year, we were 40 minutes faster. What is the percentage increase in our performance?
Blades
1st blade 2,5 m, 2nd blade. .1.75 m. How many of the same long pieces of these two blades can do the biggest? How long is one piece?
Young Cyclists
Charlie and Peter will attend the Young Cyclists Meeting today. Peter is still unable to start, so Charlie goes first alone. Peter follows him for 20 minutes. How long does it take to reach Charlie? Charlie travels at an average speed of 15km/h, and Peter

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