Multiples & LCM( Week 49 Evaluation) 1. What is the smallest natural number that is divisible by both 5 and 15? 2. Express 30 as a product of prime numbers. Type * for multiplication symbol ×. 3. A postage can be bought with all 5-cent stamps. It can also be bought with all 10-cent stamps or with all 15-cent stamps. What is the least possible amount for the postage in cents? 4. A positive integer can be divisible by 2, 3, and 4. What is the least possible value for the number? 5. Write down the first 5 common multiples of 3 and 6. Separate each number with a comma. 6. A box of pencils can be divided equally among 4, 5, or 6 children with no pencils left. What is the smallest number of pencils the box could have? 7. The digital root is the repeated digital sum of a number until finding a single-digit value, for eaxmple, 99 ⇒ 9 + 9 = 18 = ⇒ 1 + 8 = 9. Can you write down the first 10 digital roots in order corresponding to the first 10 multiples of 7 starting from 7? 8. When a positive integer is divided by 2, 4, or 6, the remainder is 1 . What is the least possible value for the number? 10. How many multiples of 2 are there between 800 and 899 inclusively with at least one digit being zero? |