Maths practice for 12-year-olds - page 268 of 351

Number of problems found: 7020

Construction 4727
Honza's kit included 19 wheels. He used them all to construct tricycles and scooters. How many complete scooters and tricycles did he build? He will find all the solutions.
Dalmatians 4726
Kamil bought 101 Dalmatians. Of these, 58 had a spot on the left ear, 15 had a black spot on the right ear, and 29 had both white ears. How much Dalmatian has black spots on both ears?
Gasoline
How many liters of gas is in the tank if its weight is 15.4kg? The specific density of gasoline is 770kg/m³.
Pizza 4
Marcus ate half a pizza on Monday night. He then ate one-third of the remaining pizza on Tuesday. Which of the following expressions shows how much pizza Marcus ate in total?
Workers 4719
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.
Influenza 4707
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.
Diamond 4695
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?
Smallest 4692
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)
Manufacturer 4686
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?
Overtake 4682
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 4679
How many 2 cm prism cubes do we need to make a 6 cm cube out of them?
Rewarded 4678
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?
Harvested 4677
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?

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