Math practice for 13 year olds - page 138 of 434
Number of problems found: 8670
- Nicolas
Nicolas and his father can repair one desk in 1/3 hour. How many desks can they repair in 3 hours? - Sharing money
A certain sum of money is shared in the ratio 2:3:9. If the difference between the first and the second is $40, then the amount of money shared is - Resulting 55991
The 180 cm long bar should be cut into two parts so that the longer part is 4 cm shorter than three times, the shorter part. Find the lengths of the resulting bar sections. - Calculate 55981
Calculate the following example: On a map with a scale of 1:50,000, two places, A and B, are 4 cm apart. Find out: a) what is the distance between these places in reality; b) what is the scale of the map in which these places are 12 cm apart? - Lcm = 22 + gcd
The least common multiple of two numbers is 22 more than their greatest common divisor. Find these numbers. - 144 steps
To get around the garden, we have to take 144 steps—eight steps less in width than in length. One step is five decimetres long. What are the dimensions of the garden? What are its perimeter and its area? - Pages
Of the 326 pages in the book, only 38 are text. The rest is the picture attachments. How many percents of the total are picture attachments?
- Jose studied
Jose studied for 4 and 1/2 hours on Saturday and another 6 and 1/4 hours on Sunday. He has allowed 1 and 1/2 hours per subject on Saturday and 1 and 1/4 hours per Sunday. How many subjects did he study? - Most divisors
Find the number with the most divisors from the natural numbers 1 to 100. - Gas prices 2021
According to the SPP price list in 2021, the price of natural gas, together with its supply, is as follows: D1 - we cook. Fix 3.34 euros/month and 0.0479 euros/kWh (1 cubic meter of gas is approximately 10.555 kWh. combustion heat changes over time as the - Calculate 55803
Calculate the weight of 2.00 moles of common salt (NaCl) in grams. M (NaCl) = 55.44 g / mol. - Calculate 55793
Calculate the material amount of a 1 kg water sample. M (H 2 O) = 18 g / mol. - Throughout 55783
Mr. Novak's salary is € 550. The employer decides to raise his salary by 15% but later reduces wages throughout the company by 15%. Calculate what salary Mr. Novák will have. - The castle The map shows the castle moat by a line 2 cm long. The moat is 500 meters long. Find the scale of the map.
- Technical 55751
The technical drawing shows the product on a 5:2 scale. Determine the length of the product if it measures 12 cm in the picture.
- A paint
A paint tin is a cylinder of 12cm and a height of 22 cm. Leonardo, the painter, drops his stirring stick into the tin, and it disappears. Work out the maximum length of the stick. - Nice two numbers What two numbers do we give a sum of 30, a difference of 24 products of 81, and a quotient of 9?
- I-beam
If an I-beam is 12'- 6 1/2" long and needs to be cut into four equal sections, how long will each section be? - Children and horses
There are some children and horses in a field. Together they have 39 heads and 122 feet. How many children are in the field, and how many horses are in the field? - Wall builders
If 12 men can build a wall 398 meters long in 48 days, how long would it take 33 men to build a wall 347 meters long? Answer to 3 decimal places.
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