Maths practice for 12-year-olds - page 263 of 347
Number of problems found: 6923
- Wallpaper needed
Calculate how many m² of wallpaper is needed to wallpaper a room with dimensions a = 3 m, b = 4 m, c = 3.5 m - Tricycles and scooters
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. - Dalmatian spots
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 ears white. How many Dalmatians have black spots on both ears? - Gasoline
How many liters of gas is in the tank if its weight is 15.4 kg? The specific density of gasoline is 770 kg/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? - 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? - 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? - 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? - 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?
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