Maths practice for 12-year-olds - page 310 of 359
Number of problems found: 7168
- Land area
The land area of Asia and Africa are in a 3:2 ratio, and the European and African are 1:3. What are the proportions of Asia, Africa, and Europe? - Planet diameters
The diameter of the Earth and the diameter of Mars are approximately 15:8, and the diameter of Mars and the diameter of the Moon are 2:1. What is the ratio of the diameters of the Earth, Mars, and the Moon? - Mother and daughter
The ratio of mother and daughter years is 5:2. After seven years, the ratio is 2:1. How many years ago was the daughter born? - Money distribution
Andrej and Jerry have a total of 540 euros. Their amounts are in the ratio of 1:8. Determine how much money each has. - Millionaire
Mr. Smith has withdrawn from the bank, saving interest € 1,500. How big was his initial deposit if the annual interest rate was 1.5%? - Math heart
A stylized heart shape is created from a square with a 5 cm long side and two semicircles over its sides. Calculate the area and its circumference. - Loan interest
Eric borrowed 50 euros from his mother for four months at a rate of 5% p.a. (per year). How much does he have to return? - Assistant
The Assistant rewrote 15% of the entire manuscript in 12 hours. How many hours must he still write to rewrite the rest of the manuscript? - Unknown number
Find an unknown number whose 1/5 is 40 greater than one-tenth of that number. - Speed of sound
The average speed of sound is 330 metres per second. Estimate how long it will take to hear a church bell 1 km away. Calculate the distance from which you would hear the sound after 10 seconds. - Cinema 5
James goes to the cinema every Tuesday for five years. After a year, he learns that a ticket on Wednesday costs only €5.10, while on other days it costs €5.60. He decides to switch to going every Wednesday instead. How much money will he save in total? - Gears
The gearing fits the wheel with 20 teeth to the wheel with 36 teeth. Before the machine is started, personnel mark the teeth of the smaller wheel and the opposite of the larger wheel. How many times after starting the machine wheels turning that painted t - Saving
Paul saves 155Kč in 46 2 Kc and 5Kc coins. How much saved 2Kc and 5Kc coins? - 6 regular polygon
A regular six-sided polygon has a side 5 cm long. Calculate its area. Compare how many more cm² (square centimeters) has a circle inscribed the 6-gon. - Division of money
Calculate how many euros Matthew, Miriam, Lucy, Michael, and Jane, when together, have 2,700 euros, and the amounts are at a ratio of 1:5:6:7:8. - Profitability
The purchase price of goods is 13000, and the sales price is 20000. What is the profitability as a percentage? - Circle r,D
Calculate the diameter and radius of the circle if it has a length 26.59 cm. - Robots Z7
In the school for robots, one class is attended by twenty Robert robots, numbered Robert 1 to Robert 20. There is currently a tense atmosphere in the class, only some robots are talking to each other. Robots with an odd number do not talk with robots with - Tributaries
The first tributary fills the pool with water in 15 hours. The second tributary fills the pool in 10 hours. For how many hours is the pool filled with both tributaries? - Floor
The rectangular floor of the living room has a length of 5.4 meters and a circumference of 17.2 meters. What is its width?
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