Maths practice for 12-year-olds - page 283 of 362
Number of problems found: 7228
- Destination 3931
The car left at 9:00 AM and arrived at the destination 144 km away at 11:00 AM. What average speed did he move? - Beginning 3930
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 3929
An aquarium has 64 * 50 * 45cm dimensions and is filled 5cm below the edge. How many liters of water are in an aquarium? How many square meters are needed to produce an aquarium? - Rails
18 m railway weighs 1260 kg. How much weighs 100 m of welded railways? - Unknown 3922
16% of the unknown number equals the square root of the number 25. Find this unknown number. - Circumference 3919
Determine the diagonal of a square whose circumference is equal to 72 cm. - Mathematical 3918
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). - Centimeters 3913 Calculate the diagonal of a square whose area equals 625 square centimeters.
- Mathematical 3911
For the variables x = 8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z) - Millimeters 3903
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?
- Percentage 3892
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have? - Chocolate 3886 Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
- Determine 3885 Determine the sum of the square roots of 81.
- Equal 3883 What is equal to twice the sixth root of 729?
- Determine 3880 Determine how much equals 16% of a) 32, b) 44, c) 34, d) 25
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