Maths practice for 12-year-olds - page 278 of 359
Number of problems found: 7167
- Cuboid easy
The cuboid has the dimensions a = 12 cm, b = 9 cm, c = 36 cm. Calculate the length of the body diagonal of the cuboid. - Symmetry
Eve loves symmetry in shapes and numbers. Yesterday she invented an entirely new kind of symmetry - divisible symmetry. She wrote all five-digit numbers with different digits with the following property: The first digit is divisible by 1, the second by 2, - Pair of numbers
Hannah gave Simon a riddle: guess a pair of numbers whose GCD is 7, and LCM is 90. Katy wanted Simon to guess such a pair for which GCD is 7, and LCM is 91. Which riddle could Simon guess? A: Katy B: Hannah C: neither D: both - Block surface
Find the surface area of a cuboid whose one face has an area of 48 cm² and another face has an area of 30 cm². - Flowers
The flower has six flowers, and each flower has a number. These are the numbers: 20,40,39,28,8,9. What number will be in the middle of the flower so that the numbers come from the flowers when we subtract and add? - Rings groups
Twenty-seven pupils attend some groups. Fourteen pupils attend the Dance group, 21 in the sports group, and 16 in the dramatic group. Dance and sporting attend nine pupils, dance and drama six pupils, and sporty and dramatic 11 pupils. How many pupils att - Sale
A camera has a listed price of $751.98 before tax. If the sales tax rate is 9.25%, find the total cost of the camera with sales tax included. - Book discount
Jurko bought the book for € 9.60. He found out that he bought it with a 36% discount. How many euros did Jurko save? - Road repair time
Ten workers managed to repair the road in 22 days. After four days, two more workers joined to speed up the work. How many days does it take to repair the road? - Class students
3/4 of the class went skiing. Of those who stayed home, 1/3 fell ill, and the remaining 6 were at a math camp. How many students does the class have? - Cube diagonals
Determine the length of the body and wall diagonals of the cube, the volume of which is equal to 0.343 decimetres. Also, calculate its surface. - Potatoes
Danielle and Michael would jointly dig potatoes for 7.5 hours. But if Danielle was working alone, she would take 2.5 hours more than if he were working with Michael. Determine how long Michael would take alone and how long Danielle would take alone. - Sheep arrangement
A shepherd has fewer than 500 sheep. If he arranges them in rows of 4, 3 are left over. If he arranges them in rows of 5, 4 are left over. If he arranges them in rows of 6, 5 are left over. But they can be arranged exactly in rows of 7. How many sheep doe - Letter puzzle
Find out what numbers need to be substituted for the letters X, Y, and Z to have the following relation: XZY + XYZ --------- YZX - How many
How many cans of blue paint need to be bought if the interior of the garden pool, which is 5 m long, 3 m wide, and 1 m deep, is to be painted? There is 1 kg of paint in each can. One can is enough for 8 m² of area. - Equation solving
Solve a simple equation with a minus before the parenthesis: 4x- (x-4) = 5-3x - Seconds to days
1000000 seconds. How many days is it? - Summands
Find two summands of the number 42 so that its product is minimized. - Installation team
The team of installers is to carry out the installation in 20 days. By adding two fitters from the beginning of the work, the assembly was completed in 15 days. How many workers were originally on the team? - Number puzzle
Which number increased by its seventh will give 32?
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