Maths practice for 12-year-olds - page 291 of 354
Number of problems found: 7071
- Sputnik
The first Earth satellite was flying at a speed of 8000 m/s. At that rate, he circled the Earth in 82 minutes. Jet flies at an average speed of 800 km/h. How long would it take to circle the Earth around? - Train speed
The train ran the distance between stations at a speed of 90km/h for 4 hours. What speed can he drive if, according to the new timetable, the journey takes an hour longer? - Egg cooking
Cooking one egg takes 4 minutes. How many minutes does it take to cook four eggs? - Unit conversion
How to calculate 2/5 m = x dm? - Cake dough
The kneaded cake dough has a volume of 1.8 l. When baking, it increases its volume by about two-thirds. Can a baked wheel fit on a baking sheet measuring 36x30x8cm? How tall will the cake be after baking? - Trip cost
A liter of gasoline costs 1.516 euros. The average consumption of the KOLO car is 6.9 l per hundred kilometers. The car has a 40-liter tank. How much will the car owner pay for the trip from Zilina to Prague and back if he follows the 413km long route? - Larger number
Which number a is 15 smaller (solve also for a is larger) than its half? - Hexagonal prism height
A container has the shape of a regular hexagonal prism with a base and a capacity of 0.5 dm2, which means three quarter-liter cups of water fill the brim. What is the height of a container? - Calculate hypotenuse
Calculate the hypotenuse of a right triangle PT if the length of one hypotenuse is 1.2 dm and the length of the hypotenuse is 1.3 dm. - Mother and son age
The son and mother are 32 years old together. My mother is 28 years older. Find how old they are. - Hockey audience
In the hockey audience between Sweden and Finland, there are 126 men, 65 boys, 46 children from Sweden, 50 children from Finland, and 200 Swedes, of which half are men and 39 women from Finland. How many people are in the audience? - Cylindrical tank
The cylindrical tank holds 600hl water and is deep 2.5 m. Calculate the diameter of the cylinder. - Paper recycling
A recycled paper made from 1.5 tons of old paper is equal to that made from 10 trees. How much paper do pupils collect to save 100 trees from falling? - Equation solving
Create a number snake from the equation and solve: 2x - 5 = 7 4x + 1/3 = 7 3 (x-2) +4 = 7 - Trip expenses
Expenditures on joint trips for pupils were: Travel expenses in euros. Meals in euros. Three nights in euros. Small expenses in euros. Calculate the amount of c that each student paid. - Tree shadow 3
What is the diameter of a tree wrapped in a rope around 3m 9dm 7cm long? How big is its cross-sectional area? - Soap cost
A box with six pieces of soap costs x crowns. How much will five pieces of soap cost? - Distance in time
The speedway goes at an average speed of kilometers per hour. Which track will it cross in 12 minutes? - Total potatoes
2/5 q of potatoes were sold in the first hour, 5/6 q in the second hour, and 40 kg in the third hour. How many kilograms of potatoes were in total? - Water height
The bottom is 25m wide and 10m long, and there is 37640 hl of water. What height does the water reach?
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