Maths practice for 12-year-olds - page 62 of 352
Number of problems found: 7034
- Calculated 81804
Mr. Hovorka pays a monthly flat rate of CZK 100 plus CZK 0.90 for each started minute of the call for his mobile phone. He calculated that each minute of the call last month cost him CZK 2.15. How many minutes was he on the phone? - Increase 81782
What ratio must we increase to 1 m to get 1 m 50 cm? - Adjust 81781
Adjust ratio 1.6:0.8 - Dimensions 81779
The picture for the textbook was reduced to a ratio of 2:5. What are the dimensions of the reduced image if the original dimensions were 20 cm and 15 cm? - Equilateral 81770
Calculate the area of the circle in which the hole is cut in the shape of an equilateral triangle when the diameter of the circle, d=32mm, and the side of the triangle, a=20.8mm. - Machine 81767
Four lathes machine 32 parts in 1 hour. How many parts does 1 turner machine have in 2 hours? - Cylindrical pool
The Novak family bought a cylinder-shaped pool with a base radius of 200 cm and a volume of 31.4 hl. Could the grandson safely jump if he is 120 cm tall? - Fractions 81761
Mom baked cakes. She set aside a third of them for her father. She left the rest on the table. Rišo came and ate a third of the cakes that were on the table. What fraction of all the pies was left on the table? Write the result in fractions. - Compartments 81755
Mr. Milan made a container for sorting waste from wood. The outside will be painted. There will be compartments for plastic and paper on the edges and for glass in the middle. How large areas will he paint with individual colors? The container has a cuboi - Dividing nuts
How many nuts would we need at least to divide the nuts equally among 10 or 18 children? - Cylindrical 81748
The hydrostatic pressure at the bottom of a cylindrical water container is 10 kPa. The bottom has an area of 0.25m². How much pressure does the water exert on the bottom? - Represents 81745
2.5 cm on the map represents 6.25 km in reality. Set the scale of the map. - ELECTRICAL 81742
A cooker connected to a 40 V voltage source draws a current of 0.5 A. DOES THE SIZE OF THE ELECTRICAL WORK DETERMINE WHICH COOKER DOES IN 3 MINUTES? - Half-circles 81731
A skier skis down a black slope. He makes a total of 31 half-circles while going down the hill. The radius of one semicircle is 4m. What distance did he travel? - Harvested 81719 Eight hop pickers harvest in 24 days. How many more pickers must be hired if the hops need to be harvested in 16 days?
- Diameter 81711
We want to stick labels on the glasses. The labels stick right around the glass. The diameter of the cup is 6 cm. The height of the label is 10 cm. a) How many labels will we make from 30 x 40 cm paper? b) How many papers of this size will we use to make - Block-shaped 81702
Calculate how many dm² of wood the craftsman needs to make a block-shaped wooden remote control stand with dimensions of 3.2 dm, 2.4 dm, and a height of 0.6 dm. - Together 81701
The sisters Pavel and Petra are 29 years old together. Pavla is 3 years younger than Petra. HOW old is Pavle? Thank you very much. - Advantageous 81698
Mr. Rezek wants to rent an Opel Corsa car for one day. He can choose from two rental tariffs: Tariff 1: Daily flat rate of CZK 1,400. Tariff 2: Daily rental 360 CZK plus 4.50 CZK for each kilometer driven. For what number of kilometers driven is it more f - Secondary 81688 Hello, this year I am doing the entrance exams for secondary school. I wanted to ask if I have an example: HOW MANY TIMES is a quarter of the number 1.5 smaller than the number 4 1/2, and I don't know what to do with that? HOW MANY TIMES will I add, subtr
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