Maths practice for 12-year-olds - page 317 of 362
Number of problems found: 7223
- 3x square
The side length of the square is 54 cm. How many times does a square's area increase if the side's length increases three times? - Pumps 5
Five pumps pumped in 3 hours 1800 hl of water. How many hectoliters of water were pumped by four equally powerful pumps in 6 hours? - Mountain
The mountain has an elevation of 7450 meters and, in the morning, is the middle portion thereof in the clouds. How many meters of height is in the sky if the clouds are below 2,000 meters and the clouds above are two-fifths of the mountain's elevation? - Crocuses
The garden grows daffodils, crocuses, and roses. 1400 daffodils, crocuses are 462 more, and roses are 156 more than crocuses. How many flowers are in the garden? - Bricklayers
Eight bricklayers build a house for 630 days. How many bricklayers must be added after 150 days to complete the building in (next) 320 days? - Keyboards keys
Michael had small keys on the shelf, which you can see in the picture. Their tones were marked on the white keys. Little Clara found the keys. As she took them off the shelf, they fell out of her hand, and all the white keys spilled out. So that the broth - Buttons
The shirt has six buttons, and the blouse has four buttons. All buttons are 176. Shirts and blouses are together 36. How many shirts and blouses?
- Sick
Sick Marcel had already taken six tablets, which was a quarter of the total number of pills in the pack. How many pills were in the pack? - Number
What number do I think? The third is 6, and a half is two more than its quarter. - Tickets
The football tournament ticket cost 45 CZK for standing and 120 CZK for sitting. Sitting spectators were 1/3 more than standing. The organizers collected a total of 12300 CZK. How many seated and standing seats (spectators)? - Glass
At the glass shop, we have to cut eight sheets of glass. Each was shaped as a square with sides of 18 cm. We paid 44 CZK. How much is 1 m² of glass? - Dog
The dog is tied to a chain, which is mounted in the corner of the yard. The yard is shaped like a square with a side length of 20 meters. The same length is also a dog chain. Are there places in the yard where the dog can't reach? - School library
The school library contains 6300 books. These comprise 7% of professional books for teachers, 18% of interest books and encyclopedias for pupils, and the rest of the fairy tales. How much are which books each type? - Classroom 4
In a class of 36 pupils, 2/3 are girls. How many girls and boys are in the class? - Family
Mom is 39 years old. Karl is eight, and Paul is four. In many years, would the mother be old, just like two children together?
- Hypotenuse
Calculate the length of the hypotenuse of a right triangle with a catheti 71 cm and 49 cm long. - Trio 2
Decide whether a trio of numbers is the side of a right triangle: 26,24,10. - Dusan
a) Dusan breaks two same windows, which have a triangular shape with a length of 0.8 m and a corresponding height of 9.5 dm. Find how much dm² of glass he needs to buy for the glazing of these windows. b) Since the money to fix Dusan has not been, it must - Parallelogram
In the parallelogram, we know one internal angle of 67°33`. Calculate the other internal angles. - Rhombus 4
The circumference of the rhombus is 44 cm, and its height is 89 mm long. Calculate its area.
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