Maths practice for 12-year-olds - page 48 of 349
Number of problems found: 6961
- Fifths 83882
What is two-fifths of 175? - Frames
A framer is to prepare 23 picture frames. The frame will have dimensions of 30 cm and 42 cm. The strips from which he will make the frames are 3 meters long. a) How many frames will he make from one strip? b) How many strips will he need? - Minutes 83870
How many minutes is five-sixths of half an hour? - Multiple 83863
The least common multiple of 2190 and b is 13140. What is b? - Increased 83849
Starka's pension of €345 was increased by 9%. What will her pension be after the increase? - Classmates 2 Classmates Peter, Vlado, and Michael arrived late to school. Peter was 1/4 hour late, Vlado was 2/8 hours late and Michael was 4/16 hours late. How many minutes late was each of them?
- Write 18
Write as a fraction, what part of the day Tina did various activities: a) sleep 9 hours, b) school 6 hours, c) television 0.5 hours and d) studying 1.5 hours. - Sports Day 2
There are 15 boys in the class. 3 boys and 2 girls did not participate in the sports day. How many girls are there in the class if 80% of the students in the class participated in the sports day? - Tin sheet
How much sheet metal is needed for a triangular prism-shaped box with an edge of 20 cm and a height of 30 cm, the height of the base is 15 cm. An additional 10% of sheet metal is needed for gluing. - Total
How many trees are there in an orchard if one-seventh of all trees are cherries, one-quarter are pears, half of the trees are apple trees, and the remaining 3 trees are plums? - DEnsity of a cuboid
What is the density of a building board in the shape of a cuboid with dimensions 1 m, 20 cm, and 20 cm, if its mass is 84 kg? - Consecutive 83783
Can you find three consecutive whole numbers such that the sum of the first and third is 128? - Truck bed
Calculate how many trucks can transport grain from the combine hopper, which is a quadrilateral with a rhombus base with sides of 13dm and 2.8m and a height of 200 cm to the longest side. The hopper is 200 cm long. The truck bed is a cuboid with sides of - Glass vessel
The cylinder-shaped glass vessel is 1 m high and has a volume of 196.25 l. Calculate the diameter of the container. - Cylindrical column
What is the mass of a reinforced concrete cylindrical column with a radius of 30 cm and a height of 4.5 m if the density of reinforced concrete is 2400 kg/m³? Round the result to whole kilograms. - Minutes 83730
In one minute, 3 and 1 and a half liters of water flow out. How many liters of water will flow out in 2 and 1 half minutes? - Kilogram chleba
We need 750g of flour for one kilogram of bread. How much flour do we need for 20 loaves weighing 1200 g? - Sheet metal troughs
A farmer orders sheet metal troughs from a tinsmith for loading calves on pasture. The tinsmith looks at a picture of the trough and estimates how much sheet metal he will need for one trough. Determine the sheet metal consumption, add 15% for waste and j - Similar triangles
We have similar triangles ABC with angle CAB=45° and angle ACB= 30° and a similar triangle OPN. What is the angle NOP in a similar triangle? - Triangle and Cone
A right triangle has legs 3 cm and 4 cm long. One cone (let's call it A) was created by rotating this triangle around the long leg, and the other (let's call it B) by rotating it around the shorter leg. Which cone has: a) a larger volume b) a smaller surf
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