Numbers
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M ATHEMATICS – E UROPEAN SECTION
2008/2009 Numbers
Exercise 1. 1. Write down in English the first 25 natural numbers. 2. Write down in English the following operations and their results: 1 + 1; 8 − 5; 5 × 7 and 36 ÷ 4. Exercise 2. 1. List the first 10 multiples of 4. 2. Find the least common multiple of 4 and 6. 3. List all the factors of 54. 4. List all the factors of 42. 5. Find the highest common factor of 54 and 42. 6. Which of those numbers are prime numbers ? 1, 2, 3, 4, 5, 6, 7, 17, 27, 37, 47, 57. Exercise 3. Karl has a mobile phone. Last month, he paid 12.8p for each minute of calls plus a monthly charge of £15.25. Last month, Karl made 246 minutes of calls. Work out the total amount that Karl paid last month. Exercise 4. From the numbers in the grid below write down: 1. a multiple of 7 2. a factor of 10 3. a factor of 51 4. a square number bigger than 10 5. a prime number bigger than 16 6. a prime number that is even 7. a number that is a multiple of 3 and also a multiple of 7. 1 6 11 16 21
2 7 12 17 22
3 8 13 18 23
4 9 14 19 24
5 10 15 20 25
2008/2009 Numbers
Exercise 1. 1. Write down in English the first 25 natural numbers. 2. Write down in English the following operations and their results: 1 + 1; 8 − 5; 5 × 7 and 36 ÷ 4. Exercise 2. 1. List the first 10 multiples of 4. 2. Find the least common multiple of 4 and 6. 3. List all the factors of 54. 4. List all the factors of 42. 5. Find the highest common factor of 54 and 42. 6. Which of those numbers are prime numbers ? 1, 2, 3, 4, 5, 6, 7, 17, 27, 37, 47, 57. Exercise 3. Karl has a mobile phone. Last month, he paid 12.8p for each minute of calls plus a monthly charge of £15.25. Last month, Karl made 246 minutes of calls. Work out the total amount that Karl paid last month. Exercise 4. From the numbers in the grid below write down: 1. a multiple of 7 2. a factor of 10 3. a factor of 51 4. a square number bigger than 10 5. a prime number bigger than 16 6. a prime number that is even 7. a number that is a multiple of 3 and also a multiple of 7. 1 6 11 16 21
2 7 12 17 22
3 8 13 18 23
4 9 14 19 24
5 10 15 20 25
