1) This document discusses finding the least common multiple (LCM) of sets of numbers and multiplying multiples of 10, 100, and 1000. 2) It provides examples of multiplying numbers with differing numbers of zeros and explains that the product can contain more zeros than the factors. 3) Practice problems are included for finding LCMs and multiplying numbers with multiples of 10, 100, and 1000.

1. Review Is 30 a common multiple of 2 and 5? How do you know? Find the LCM or Least Common Multiple of each set of numbers . 5, 7 4, 9 2, 6, 8

2. Multiples of 10, 100, and 1000 By: Miss B 

3. When multiplying by multiples of 10, 100, and 1000, first multiply the non-zero digits . Then, count the number of zeros in both factors . Write that number of zeros in the product.

4. A fifth grader’s heart normally beats 90 times in 1 minute. How many times does it beat in 1 hour?

5. Can the product ever contain more zeros than the number of zeros in the factors? Yes, if the product of the non-zero digits is itself a multiple of 10, for example, 4 x 5

6. 80 x 90 90 x 90=

7. 4 x 70 5 x 900

8. 6,000 x 6 90 x 30

9. 12 x 10 30 x 40

10. 2 x 6000 60 x 20

11. 60 x 50 80 x 200

12. 90 x 70 2 x 5,000

13. 50 x ____ = 2,500 4 x _____ = 160 ___ x 90 = 18,000

14. ___x 80= 4,000 ___x 300 = 6,000

15. An adults heart pumps about 5 liters of blood every minute. About how much blood is pumped in an hour? Problem Solving