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# Mental Math Multiplyinglesson2.4

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### 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