Division of Numbers

The least common multiple and greatest common divisor

Problem 1. How many of the numbers 1, 3, 8, 11, 13, 15, 17, 19, 21 are simple:

6      5      7      4    

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Problem 2. Which of the numbers can be divided by 3:

3301      7701      7702      1204    

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Problem 3. Which of the numbers can be divide d by 2:

412321      222111      300505      107312    

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Problem 4. The number 330 is presented in a product of simple factors thus

2.2.5.7      3.5.7.11      2.3.5.11      none of the above

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Problem 5. The number 4822x is divided by 3 and is not divided by 2. Which digit should be put in place of the letter x?

2      3      5      7    

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Problem 6. The number 44x58y figure is divided by 2 and 5, and 3. The digits to be placed in the places of x and y are?

1 and 5     6 and 0     1 and 6     7 and 5

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Problem 7. The greatest common divisor of (42.54) is:

12      6      3      2    

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Problem 8. The least common multiple of the numbers (12;14;18) is:

42      504      84      252    

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Problem 9. If the least common multiple of the numbers (35;42;30) : x is equal to the least common multiple of the numbers (5;6), then x is:

7      8      9      10    

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Problem 10. Whiout calculating the products, which of the statements is true:

21.33 can be divided by 9     49.18 can be divided by 14     5.12.19 can be divided by 20     10.23.27 can be divided by 25