Question : Which is the least number divisible by 6, 18, 20, and 32?
Option 1: 108
Option 2: 640
Option 3: 1440
Option 4: 360
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Correct Answer: 1440
Solution : The least number divisible by 6, 18, 20 and 32 is their least common multiple (LCM). Factors of 6 = 2 × 3 Factors of 18 = 2 × 3 × 3 Factors of 20 = 2 × 2 × 5 Factors of 32 = 2 × 2 × 2 × 2 × 2 $\therefore$ The LCM of 6, 18, 20, and 32 = 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 = 1440 Hence, the correct answer is 1440.
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Question : Directions: Identify the number that does NOT belong to the following series. 1.5, 2, 3, 6, 18, 108, 1964
Option 2: 6
Option 3: 18
Option 4: 1964
Question : Which is the smallest three-digit number which when increased by 5 becomes divisible by both 2 and 3?
Option 1: 102
Option 2: 105
Option 3: 103
Option 4: 108
Question : Directions: Which two numbers should be interchanged to make the given equation correct? 108 ÷ 6 – 18 + 8 × 9 = 42
Option 1: 108 and 18
Option 2: 9 and 6
Option 3: 18 and 9
Option 4: 6 and 8
Question : What is the least number that should be added to 478 so that the number obtained becomes exactly divisible by 5, 6, and 12?
Option 1: 62
Option 2: 12
Option 3: 2
Option 4: 52
Question : Which smallest number must be added to 100, so that the resulting number is completely divisible by 6?
Option 1: 2
Option 2: 3
Option 3: 5
Option 4: 4
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