Maths practice for 12-year-olds - page 313 of 351
Number of problems found: 7008
- Nine balls
Imagine that you have exactly the same appearance as nine balls, of which one has a greater mass than the other. You have isosceles weights. Post a procedure as you would using weights to discover heavier balls. How many measurements at least do you have - Expressions: 2381
Determine the values of the following expressions: a) 3² - (- 4) b) 4-321 c) -32-7 - Car mileage
The car drove successively 2.5x105 m, 1.4x107 mm, 8.6x107 dm, and finally 3x106 cm. What is the total mileage? - Right triangle - leg
Calculate the nearest tenth cm leg length in the right-angled triangle with hypotenuse length 9 cm and 7 cm long leg. - Diagonal - simple
Calculate the length of the diagonal of a rectangle with dimensions 5 cm and 12 cm. - Triangle eq
Calculate accurate to hundredths cm height of an equilateral triangle with a side length 12 cm. Calculate also its perimeter and area. - Euros
Michal, Peter, John, and Lenka got together 2,400 euros. Do they share an amount in a ratio of 2:6:4:3. How many got each of them? - Divide money
Divide 1200 USD at a ratio of 1:2:3:4:5:6:9:10 - Similarity
ABC is a triangle wherein a = 4 cm, b = 6 cm, c = 8 cm. Is it similar to the triangle DEF: d = 3 cm, e = 4.5 cm, f = 6 cm? If so, determine the ratio of similarity. - Perpetrator
A perpetrator is a number that is smaller than the number 80. It is a multiple of five, and it is odd. If we add up the tens and ones of this number, we get the number 8. - Container
How many three-quarters liters jars fill 30 liter containers? - Addends
Number 118 is divided into two addends, so the first addend is 69, greater than 75% of the second addend. - Florist
The florist has 84 red and 48 white roses. How many bouquets can he make from them if he must use all roses? - Mr. Happy
Mr. Happy planted 36.6 meters of square garden grass; It's a third of the garden, more than half of the garden. What is the square area of this garden? - Pavilion
The rectangular pavilion with dimensions of 3.5 m and 2.75 m is to be paved with square tiles of side 25 cm, with a price of CZK 22 per 1 piece, or rectangular tiles with sides of 20 cm and 15 cm at the price of CZK 11 per 1 pc. Which solution is cheaper - Pumps 5
Five pumps pumped in 3 hours 1800 hl of water. How many hectoliters of water were pumped by four equally powerful pumps in 6 hours? - Mountain
The mountain has an elevation of 7450 meters and, in the morning, is the middle portion thereof in the clouds. How many meters of height is in the sky if the clouds are below 2,000 meters and the clouds above are two-fifths of the mountain's elevation? - Crocuses
The garden grows daffodils, crocuses, and roses. 1400 daffodils, crocuses are 462 more, and roses are 156 more than crocuses. How many flowers are in the garden? - Bricklayers
Eight bricklayers build a house for 630 days. How many bricklayers must be added after 150 days to complete the building in (next) 320 days? - Keyboards keys
Michael had small keys on the shelf, which you can see in the picture. Their tones were marked on the white keys. Little Clara found the keys. As she took them off the shelf, they fell out of her hand, and all the white keys spilled out. So that the broth
Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.
