Maths practice for 12-year-olds - page 205 of 350

Number of problems found: 6986

Temperature change
The mean temperature change is -3.2°F per day for five days. What is the total change over the five days?
Last page
Two consecutive sheets dropped out of the book. The sum of the numbers on the sides of the dropped sheets is 154. What is the number of the last page of the dropped sheets?
Evaporated 8155
After drying 1 kg of flowers, 0.17 kg of dried flowers remained. After drying 1 kg of leaves, 0.46 kg of dried leaves remained. How many kilograms of water evaporated by drying 1 kg of flowers and 1 kg of leaves?
Children's 8154
A father bought books for his children's birthdays. Zdenka purchased the book for 24.60, and Milan bought the book 6.70 more expensive. How much did the father pay for both books?
Thought 8153
When I add half of the thought number to 3/5 of the thought number, I get the sum of 22. Which number do I think?
Expression 8151
For what values of x is the value of the expression 5x + 11 equal to that of the expression 7x + 31?
Expression 8150
Find for which x the value of the expression 13x - 7 is eight less than the value of the expression. 12x + 11.
Previous 8148
The sum of three natural numbers is 204. Each of them is five greater than the previous one. What are the numbers?
Pillar 8147
The height of the column is 75 cm and still half its height. How tall is the pillar?
Dentist
Class 5. I participated in a preventive dental examination. A quarter of the pupils found two dental caries, and an eighth found one caries. Half the class had all their teeth healthy. How many students attend class 5? If four students were missing on the
Circumference 8137
One side of the rectangle is 8 cm long. When we enlarge the dimensions of this rectangle four times, we get a rectangle with a circumference of exactly 1m. How many mm does the other side of the unmagnified rectangle measure?
Six percents
6% of the base is 21. How much is 28% of this base?
Initial price
The price of the T-shirt was initially 379 CZK, but it was reduced by 16%. How much does it cost now?
Determine 8115
The number of blue and green candies is 5:6. and The number of red and green candies is 3:8. Determine the ratio of red and blue candies.
Reducing 8114
By reducing the unknown number by 342, you get 81% of the unknown number. Find this number.
Received 8112
Matej, Simon, and Peter shared a profit in the ratio of 3:4:5. How much did they win in total if Matej received CZK 1,520?
The sponsor
The school received money from the sponsor. She used one-third to buy computers and half of the rest to adjust the gym. It still has 4000 euros left. How many euros did the sponsor donate to the school?
Prism 4 sides
Find the surface area and volume of a four-sided prism high 10 cm if its base is a rectangle measuring 8 cm and 1.2 dm.
Determined 8095
Jeníček weighed a broken piece of brick and found that it weighed 48 grams. Using a measuring cylinder, he determined its volume at 30 cm³. What is the density of the brick?
Predetermined 8094
Lumberjacks cut down a predetermined number of trees over the course of three days. On the first day, they cut down a quarter of the trees; on the second day, they cut down 6 more trees than on the first day; on the third day, they cut down 6 more trees t

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