Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Mental Math Multiplyinglesson2.4

620 views

Published on

Published in: Education, Technology
  • Be the first to comment

Mental Math Multiplyinglesson2.4

  1. 1. Review <ul><li>Is 30 a common multiple of 2 and 5? How do you know? </li></ul><ul><li>Find the LCM or Least Common Multiple of each set of numbers . </li></ul><ul><li>5, 7 4, 9 2, 6, 8 </li></ul>
  2. 2. Multiples of 10, 100, and 1000 By: Miss B 
  3. 3. <ul><li>When multiplying by multiples of 10, 100, and 1000, first multiply the non-zero digits . </li></ul><ul><li>Then, count the number of zeros in both factors . Write that number of zeros in the product. </li></ul>
  4. 4. <ul><li>A fifth grader’s heart normally beats 90 times in 1 minute. How many times does it beat in 1 hour? </li></ul>
  5. 5. <ul><li>Can the product ever contain more zeros than the number of zeros in the factors? </li></ul><ul><li>Yes, if the product of the non-zero digits is itself a multiple of 10, for example, 4 x 5 </li></ul>
  6. 6. <ul><li>80 x 90 </li></ul><ul><li>90 x 90= </li></ul>
  7. 7. <ul><li>4 x 70 </li></ul><ul><li>5 x 900 </li></ul>
  8. 8. <ul><li>6,000 x 6 </li></ul><ul><li>90 x 30 </li></ul>
  9. 9. <ul><li>12 x 10 </li></ul><ul><li>30 x 40 </li></ul>
  10. 10. <ul><li>2 x 6000 </li></ul><ul><li>60 x 20 </li></ul>
  11. 11. <ul><li>60 x 50 </li></ul><ul><li>80 x 200 </li></ul>
  12. 12. <ul><li>90 x 70 </li></ul><ul><li>2 x 5,000 </li></ul>
  13. 13. <ul><li>50 x ____ = 2,500 </li></ul><ul><li>4 x _____ = 160 </li></ul><ul><li>___ x 90 = 18,000 </li></ul>
  14. 14. <ul><li>___x 80= 4,000 </li></ul><ul><li>___x 300 = 6,000 </li></ul>
  15. 15. <ul><li>An adults heart pumps about 5 liters of blood every minute. About how much blood is pumped in an hour? </li></ul>Problem Solving

×