# Test: Division of Numbers

### The least common multiple(LCM) and greatest common divisor(GCD)

Authors - Annie Nikolova, Iliana Hristova and Nadia Rashkova from OU "Anton Strashimirov", Bulgaria

Problem 1. How many of the numbers 1, 3, 8, 11, 13, 15, 17, 19, 21 are simple:
6      5      7      4

Problem 2. Which number is divisible by 3:
3301      7701      7702      1204

Problem 3. Which number is divisible by 2:
412321      222111      300505      107312

Problem 4. The number 330 is represented as a product of:
2×2×5×7
3×5×7×11
2×3×5×11
none of the above

Problem 5. The number 4822a is divisible by 3 and is not divisible by 2. Find a.
2      3      5      7

Problem 6. The number 44a58b is divisible by 2, 5 and 3. Find a and b.
1 and 5     6 and 0     1 and 6     7 and 5

Problem 7. The greatest common divisor of 42 and 54 is:
12      6      3      2

Problem 8. Least common multiple - LCM(12, 14, 18) is:
42      504      84      252

Problem 9. If LCM(35, 42, 30) : x = LCM(5, 6), then x is:
7      8      9      10

Problem 10. Without calculating the products, which of the statements is false:
21×33 is divisible by 9
49×18 is divisible by 14
5×12×19 is divisible by 20
10×23×27 is divisible by 25

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