Arithmetic - practice for 12 year olds - page 97 of 101
Number of problems found: 2016
- Average
The average of 5 numbers is 108. What is its sum? - In center
What number lies in the center between a quarter of a fifth and a half of a third on the number axis? - Certificate
There are 31 students in a class. The mathematics score wasn't worse than 2. The average score in mathematics was 2. How many students have a score of one, and how many have a score of 2? - Line segment
Line segment AB is 8 cm long. Divide it by a ratio of 2:3.
- Pizza master
Master says that he can split pizza into 16 parts by five equals straight cuts. Is it possible? - Midnight 2
It was 8 degrees at nightfall. The temperature dropped 10 degrees by midnight. What was the temperature at midnight? - The temperature 16
The temperature at 6 AM was 21 degrees Fahrenheit. By noon, dropping 32 degrees Fahrenheit. What was the temperature at noon? - Four-digit 10261
Roman likes magic and math. Last time he conjured three- or four-digit numbers like this: • created two new numbers from the given number by dividing it between digits in the place of hundreds and tens (e.g., from the number 581, he would get 5 and 81), • - Arithmetic 82287
If the arithmetic mean of the numbers a1, a2, a3, a4, and a5 is the number A, the arithmetic mean of the numbers a1, a2, a3, and a4 is the number B, then what is a5 equal to?
- Previous 43371
The sum of three natural numbers, five greater than the previous one, is 204. Which are the numbers? - What fraction
What fraction of numbers 1 to 30 is prime? - Backpacking 2579
Aleš, Karel, and Simon went on a trip at 6:45. They arrived at the finish line at 9:15. They carried one backpack with them and took turns after 20 minutes. Karel carried the first section, and at 8.30 by Simon. a) Who carried the backpack in the second s - Expression 35981
I think the number is when you substitute it in the expression (x-4). (2x-1), you get zero. What number can it be? - Number train
The numbers 1,2,3,4,5,6,7,8 and 9 traveled by train. The train had three cars, and each was carrying just three numbers. No. 1 rode in the first carriage, and in the last were all odd numbers. The conductor calculated the sum of the numbers in the first,
- Arithmetic 72544
The arithmetic mean of two numbers is 12. The first number is 5. What is the value of the second number? - Sequence 4378
Find out the other three members of the sequence and write their sum: 1,29,2,28,3,27, - Arithmetic average
The arithmetic mean of the five numbers is exactly 8. The sum of these four numbers is 30. What is the fifth number? - Centipede 4257
Centipede Mirka consists of a head and several articles. Each pair has one pair of legs. When it got cold, she decided to get dressed. Therefore, she put on a sock on her left foot in the third article from the end and then on every other third article. S - Average
The arithmetic mean of the two numbers is 67.5. One number is -31. Calculate the second number.
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