Maths practice for 12-year-olds - page 253 of 347

Number of problems found: 6932

Departure time
The truck arrived in Brno at 6 pm, 14 minutes and 50 seconds. The journey took 5 hours, 17 minutes 20 seconds. What time did the truck go?
Water flow
120 hl of water flows out of the tank through 4 pipes in 16 hours. How much water flows through 5 identical pipes in 14 hours?
Image reduction
To say that I am mathematically challenged is a gross understatement! I'm trying to help my friend determine how to calculate percentages of reduction or enlargement for a quilt pattern. She is creating a drawing of a cute picture that will become a piece
Wheel revolutions
The diameter of the motorcycle wheel is 60 cm. How many times does the wheel turn on a track 1,884 km long?
Paper production
About 50% of the pulp is obtained from wood and about 65% from paper. How many tons of paper can we make from 150 tons of wood?
Family equation
father + mom = children How many solutions does this problem have?
Gardens colony
The garden's colony, with dimensions of 180 m and 300 m, is to be completely divided into the same large squares of the highest area. Calculate how many such squares can be obtained and determine the length of the square side.
The buns
Kate, Zofia, and Peter liked the buns. Even today, their grandmother prepares their favorite meal. Kate eats four bunches, Sophie 3, and Petra eats five buns. Their grandmother said, "My inmate, will you know how many buns I have been made today if those
Fence boards
The fence around the garden is made of rhombus-shaped laths with a side 30 cm long and 1.6 m high. How many square meters of boards are needed to make a fence of 300 laths?
Interior designer
To make draperies, an interior designer needs 11 1/4 yards of material for the den and 8 1/2 yards for the living room. If material comes only in 20-yard bolts, how much will be left over after completing both draperies?
Glass balls
Clay balls and several transparent glass balls spilled out of Peter's pouch. Color the balls one by one if you know that 1/6 were red, 3/8 were blue, 7/24 were green, and 1/12 were yellow. How many glasses did he have?
Product calculation
the product of the sum and difference of the numbers -2.3 and 4.7
Apple difference
If Zina gives Darina one apple, then both girls will have the same. How many more apples does Zina have now than Darina?
Triangle area
The triangle is divided into three parts. The part at the vertex C occupies a third of the area of the triangle, the part at the vertex B is two-fifths of the area of the triangle, and the remaining part at the vertex A has an area of 4 m². Calculate the
Rhombus construction
Construct a rhombus ABCD if AB = 5 cm, BD = 6 cm and AC = 3 cm
Sugar 9
150 kg of sugar beet yields 24 kg of sugar. How many tons of sugar beet can be obtained from three tons of sugar?
Equation solving
x / 9-3-2x / 3 = 1-2 / 9-x
Cyclists meeting
Two cyclists drove from two cities 66 km apart. One drove at an average speed of 18 km/h, the other at 15 km/h. How many hours will they meet?
Copper density
The copper roller weighs 547.4 g. To determine its volume, use the copper density, which is ρ = 8960 kg/m³.
Passenger trains
Two trains are traveling towards each other on parallel tracks, one at a speed of 34 km/h and the other at a speed of 47 km/h. A passenger sitting on the second train noticed that the first train passed him in 6 seconds. How long is the first train?

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