Maths practice for 12-year-olds - page 212 of 355

Number of problems found: 7083

Calories 2
Ben eats approximately 2400 calories per day. His wife Sarah eats 5/8 as much. How many calories does Sarah eat per day?
Equivalent fractions
Are these two fractions -4/9 and 11/15 equivalent?
Flowerbeds
What is the smallest length of flowerbeds we must prepare to plant seedlings at grids of 20,30,25,40 cm?
The pot
The pot is a cylinder with a volume of V = 7l and an inner diameter of d = 20cm. Find its depth.
The cube
The cube has a 25 cm edge. We cut it into small cubes with 5 cm long sides. How many of these little ones are left when we build a new cube of 20 cm in length?
Number sum change
How much does the sum of three two-digit numbers change when we increase the first by 20, decrease the second by 10, and leave the third unchanged?
Circle position sketch
Sketch the relative position of the circles k1 (S1, r1 = 5cm) and k2 (S2, r2 = 3cm) and k / S1S2 / = 0 cm and give its name.
Money Sharing Equal Amount
Sylva and Šárka have 20 CZK together. If Sylva gives Šárka 6 CZK, they will have the same. Sylva has how many more CZK?
Five Odd Numbers Sum
The sum of five consecutive odd numbers is 35. What are these numbers?
Mixing Celsius and Fahrenheit
Add up three temperatures: 5°F +6°F +0°C
Inlet minus outlet
Water flows into the tank through two pipes and out of the third pipe spontaneously. Pipe A would fill the tank in 3 hours, pipe B would fill in 4 hours, and pipe C would flow out in 12 hours. If all three pipes open simultaneously, how long will the tank
Company layoff proportion
The company RAK employs two groups of workers: workers and administration. There are three times more workers than the administration. Half of the administration and a third of the workers will be laid off. What proportion of the company's employees will
Cube root
For 13, Sam wrote 2891 instead of the correct cube number. By how much was he wrong?
Velocipedes
In the 19th century, bicycles had no chain drive, and the wheel axis connected the pedals directly. This wheel diameter gradually increased until the so-called high bikes (velocipedes) had a front-wheel diameter of up to 1.5 meters, while the rear wheel w
Pool capacity
The pool is 30 m long, 12 m wide, and 2 m deep. Can it contain 7,000 hl of water? If so, what is the level? If not, how much extra water is there?
Flowerbed
Ondra digs the bed in 20 minutes, Cuba in 30 minutes. How long do they dig together?
Tony works
Tony works as a welder for a construction company. His hourly wage is $15.51, and he works 40 hours per week. Tony gets paid vacation each year. The construction company is doing well and has plenty of work for the next year. Tony can expect to work the e
Expression value puzzle
Number 1 is the value of the expression: a 5-3 b. 22 - 32 c. (2 - 3)² d. 2 - 32 e. 32 - 22
Opposite sum difference
The opposite sum of numbers 12 + 13 adds the opposite number of their difference. Which of the following is correct?
The thermometer
At 8:00 in the morning, the thermometer showed an outside temperature of 16.7 degrees. It rose by 2.6 degrees in two hours. What temperature did we have at 10:00?

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