Maths practice for 12-year-olds - page 203 of 355
Number of problems found: 7083
- Rectangle area calculation
Calculate the area of the rectangle if its circumference is 24cm and one side is 7.2cm long. - Expressions
Let k represent an unknown number and express the following expressions: 1. The sum of the numbers n and two 2. The quotient of the numbers n and nine 3. Twice the number n 4. The difference between nine and the number n 5. Nine less than the number n - Expressions with variable This is an algebra problem. Let n represent an unknown number and write the following expressions: 1. 4 times the sum of 7 and the number x 2. 4 times 7 plus the number x 3. 7 less than the product of 4 and the number x 4. 7 times the quantity 4 more than
- Algebra problem This is algebra. Let n represent an unknown number. 1. Eight more than the number n 2. Three times the number n 3. The product of the numbers n and eight 4. Three less than the number n 5. Three decreased by the number n 6. Two less than three times the u
- Magic number conjuring
Roman likes magic and math. Last time he conjured three- or four-digit numbers like this: • created two new numbers from the given number by dividing it between digits in the place of hundreds and tens (e.g., from the number 581, he would get 5 and 81), • - Wood prisms
How many weigh 25 prisms with dimensions of 8x8x200 cm? 1 cubic meter of wood weighs 800 kg. - Plan scale
The actual width of the room is 66 dm, and the width in the plan is 4.4 cm. What scale corresponds to the plan? - Water level
How many cm will the water level in a cube-shaped tank with an edge of 3 m drop if we discharge 189 hl of water? - Almonds
Rudi has 4 cups of almonds. His trail mix recipe calls for 2/3 cup of almonds. How many batches of trail mix can he make? - Quantities
Let x represent one quantity. State what that quantity represents. Express the second quantity in terms of x. The length of the rectangle is 4 inches less than eight times the width. - Car loop
The toy car runs at an average speed of 2 m/s. In a minute, it will pass the entire circuit five times. How long is the loop? - Turtles 2
A box turtle hibernates in the sand at 11 5/8 ft. A spotted turtle hibernates at 11 16/25 feet. Which turtle is deeper? Write the answer as number 1 or 2. - Tank of fuel
A 14.5-gallon tank of fuel is 3/4 full. How many more gallons will it take to fill up the tank? - Iron pipe weight
The iron pipe has a length of 2m and a diameter of 4cm. If the density of iron is 7870 kg/m3, calculate its weight. - Cattle trough volume
The cattle water feeding trough is a half-cylinder with a length of 2 m and a width of 0.8 m. How many m³ of water can be poured into the gutter? How many m² do we need to produce 25 such gutters? - Continent area proportion
The area of Asia and Africa is 3:2, and the area of Europe and Africa is 3:7. In what proportion are the sizes of Asia, Africa, and Europe? - Four-digit number
Find all four-digit abcd numbers with a digit sum of 12 such that ab-cd = 1 - Jared's room painting
Jared wants to paint his room. It is 12 feet by 15 feet and has walls 9 feet high. Two windows measure 6 feet by 5 feet each, and two doors measure 30 inches by 6 feet each. If a gallon of paint covers approximately 350 square feet, how many gallons will - Rainwater
If 6 mm of water rained on the garden with an area of 25 acres, how many 12-liter cans of water would we need to water this garden? - Trolley approach speed
Two trolleys cross the platform at the station facing each other. One of them travels at a speed of 10.2 km/h, the other at a constant speed of 7.8 km/h relative to the platform. At what speed is the driver of the first cart approaching the driver of the
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