Maths practice for 12-year-olds - page 281 of 354
Number of problems found: 7071
- Ball count
Roland has 490 balls. If he gave 145 bullets to Marek, he would still have 100 more bullets than Marek. How many balls did Marek have at the beginning? How many shots do they have together? - Dimensions of glass
An aquarium has 64 * 50 * 45 cm dimensions and is filled 5 cm below the upper edge. How many liters of water are in an aquarium? How many square meters of glass are needed to produce an aquarium? - Rails
18 m railway weighs 1260 kg. How much weighs 100 m of welded railways? - Unknown number
16% of the unknown number equals the square root of the number 25. Find this unknown number. - Square diagonal
Determine the diagonal of a square whose circumference is equal to 72 cm. - Expression evaluation
For the variables x = -8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z) - Average speed
What is the average speed you have to move around the world in 80 days? (Path along the equator, round to km/h). - Square diagonal Calculate the diagonal of a square whose area equals 625 square centimeters.
- Expression evaluation
For the variables x = 8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z) - Cube measurements
The surface area of one cube wall is 2500 square millimeters. Determine the cube's surface, the length of its edge, and its volume. - Cube 5 The surface area of one cube wall is 32 square centimeters. Determine the length of its edges, its surface, and volume.
- Cube edge Determine the cube's edges when the surface is equal to 37.5 cm square.
- Unknown number 7
16% of the unknown number is 21 less than the unknown number itself. Determine the unknown natural number. - Three children
Three children eat eight chocolates in 6 days. How many chocolates do six children eat in 18 days? - Coconut percentage
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have? - Cocoa percentage Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
- Square root sum Determine the sum of the square roots of 81.
- Root calculation What is equal to twice the sixth root of 729?
- Percentage calculation Determine how much equals 16% of a) 32, b) 44, c) 34, d) 25
- Change the numbers in the ratio
Change the numbers 29, 38, and 43 in a 3:4 ratio.
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