Math practice for 13 year olds - page 167 of 428
Number of problems found: 8555
- Two dice
We roll two dice. What is the probability that the sum of the falling numbers is greater than 3? - Geometry exercise
Calculations from geometry: The ratios of the sides of the quadrilateral are 3 : 6:4.5 : 3.5. Calculate their lengths if the circumference is 51 cm. The sizes of the angles in the quadrilateral are equal to 29°30', 133°10', and 165°20'. What is the size o - Fraction number
Fractions: 14/17. 34/56 + 6/9 + 10/13 : 5/26 = 10/16 - ¼ + 15/18 : 5/9 = ¾. (25/42 - 3/7) +16/21 : 4/7 = 2. Whole numbers: (-12) + (-6). (-2) - (-14) : 2 = 35 : (-5) + (-12) . 2 + (-6) = 42 : (-3) . (-5) - (-12)+ (-16) = - Washing machine loan
Tomáš took out a loan to buy a washing machine. In the following 12 months, according to the contract, he had to repay the amount of 150 euros. The price of the washing machine is 1200 euros. What percentage is the annual interest rate? Write in the form - Bank loan
Zuza borrowed a certain amount from the bank, with the proviso that she would return 15,000 euros a year. The annual interest rate was set at 4.5%. How much did Zuza borrow? - Cleaning 2
Maggie is looking to hire a carpet cleaning company. Cleaning Crew Inc. charges $24 for supplies and then $18 per room. If Maggie has $96 to spend on cleaning the carpets, how many rooms can she have cleaned? - Number divisibility What is the probability of any two-digit natural number a) is divisible by seven, b) is divisible by nine, c) is not divisible by five.
- Number fraction
7/10 from number K is 28 What is the number K =? - Apartment building
Two hundred eight people live in the apartment building. There are as many women as there are men, but there are 22 more children than women. How many adults live in an apartment building? - Pilgrimage spending Pavel spent CZK 315 on the pilgrimage in three days, doubling his spending every following day. How much CZK did he pay on the first day?
- Bank interest comparison Father put €600 in a bank that pays government interest at a rate of 3%p. A. Grandfather put €610 in a bank that will make governments at a rate of 2%p. A. Which will have more money if they withdraw from the bank after one year?
- ABC isosceles
ABC isosceles rights triangle the length of each leg is 1 unit what is the length of the hypotenuse AB in the exact form - Machine efficiency loss
What percentage is the loss of a machine that works with an efficiency of 0.78? - Engine performance
The car's engine develops a power of 1800N. Find its performance if it travels evenly on a horizontal path at 48 km/h. - Sphere surface
The volume of the sphere is 803.84m³. Calculate its surface. - Five-digit number
Anna thinks of a five-digit number not divisible by three or four. If he increments each digit by one, it gets a five-digit number divisible by three. If he reduces each digit by one, he gets a five-digit number divisible by four. If it swaps any two digi - Cage gravitational energy
Find the potential gravitational energy of a 2000kg tow cage relative to the bottom of an 850m deep draw pit when the cage is on the surface. - G Force, mass The car, with a weight of 20 kN, travels at a speed of 54 km/h. What is its kinetic energy?
- Nail work
What work do we do if we pull out a 58mm nail with an average force of 350N? - Happy marriage
Jan and Marienka have been in a happy marriage for several years. Jan's age is written in the same numbers as Marienka's, only in reverse order. Their ages differ by just a fifth of Marienka's. Jan is older. How old is Jan, and how many is Marienka?
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