2-2 Practice B Reg.pdf - MrWalkerHomework

LESSON2-2Multiply.Practice BPowers of Ten and Scientific Notation1. 6 • 10 3 2. 22 • 10 1 3. 8 • 10 2 4. 18 • 10 06,000220800185. 70 • 10 2 6. 25 • 10 3 7. 3 • 10 4 8. 180 • 10 37,00025,00030,000 180,000Find each product.9. 84 • 10 4 10. 315 • 10 2 11. 210 • 10 3 12. 1,004 • 10 3840,000 31,500 210,000 1,004,000513. 1,764 • 10 1 14. 856 • 10 0 15. 4,055 • 10 3 16. 716 • 10 417,6408564,055,000 7,160,0003.4 10 4 7.7 10 3 2.1 10 6 4.04 10Write each number in scientific notation.17. 34,000 18. 7,700 19. 2,100,000 20. 404,0002.1 10 7 6.12 10 2 3.001 10 6 6.213 10 521. 21,000,000 22. 612.00 23. 3,001,000 24. 62.13 • 10 44.8 10 625. Lake Superior covers an area of about 31,700 square miles.Write this number in scientific notation.3.17 10 426. Mars is about 1.42 • 10 8 miles from the sun. Write this number instandard form.142,000,00027. In 1999, the population of China was about 1.25 • 10 9 . What wasthe population of China written in standard form?1,250,000,00028. A scientist estimates there are 4,800,000 bacteria in a test tube.How does she record the number using scientific notation?Copyright © by Holt, Rinehart and Winston.19 Holt Middle School Math Course 2All rights reserved.LESSON2-2Multiply.Practice CPowers of Ten and Scientific Notation1. 5 • 10 3 2. 471 • 10 2 3. 39.5 • 10 1 4. 200 • 10 55,00047,100395 20,000,0005. 7,025 • 10 0 6. 5.7 • 10 6 7. 66.25 • 10 4 8. 9.01 • 10 97,025 5,700,000 662,500 9,010,000,0002.5 10 4 9.9 10 3 9.7 10 6 9.56 10 9Write each number in scientific notation.9. 25,000 10. 9,900 11. 9,700,000 12. 95.6 • 10 82.3 10 10 1.1 10 2 3.019 10 7 7.355 10 513. 23,000,000,000 14. 110.00 15. 301.9 • 10 5 16. 73.55 • 10 4Write the missing number or numbers.17. 1.23 10 ? 12,300 18. 8.3 10 5 ? 19. 112,000,000 ? 10 84830,0001.1220. 410,000 ? 10 5 21. 7.7 10 7 ? 22. 2,950,000 2.95 10 ?4.177,000,000623. The Caspian Sea covers an area of about 143,250 squaremiles. Write this number in scientific notation.1.4325 10 524. The distance between Jupiter and Saturn is about 4.03 10 8miles. Write this number in standard form.403,000,00025. In 1999, the population of the world was about 5.996 10 9 .What was the population in standard form?5,996,000,00026. A scientist estimates there are 37,000,000 bacteria in a petridish. He records the number using scientific notation. What doeshe write?3.7 10 7Copyright © by Holt, Rinehart and Winston.20 Holt Middle School Math Course 2All rights reserved.LESSON2-2ReteachPowers of Ten and Scientific NotationTo multiply by a power of 10, use the exponent to find the number ofzeros in the product.• Multiply 42 • 10 4 .The exponent 4 tells you to write 442 • 10 4 zeros after 42 in the product. 420,000Find each product.1. 84 • 10 3 2. 61 • 10 5The product should have 3 zeros. The product should have 5 zeros.84 • 10 3 84,00061 • 10 5 6,100,0003. 22 • 10 6 4. 753 • 10 3 5. 825 • 10 2 6. 123 • 10 122,000,000 753,000 82,5001,230• Write 926,000 in scientific notation.First, write the digits before the zeros as a number greater than orequal to 1 and less than 10. The number must have only 1 digit tothe left of the decimal point. That digit cannot be zero.0 1 2 3 4 5 6 7 8 9 10Think: 9.26 is greater than 1 and less than 10.Then multiply 9.26 by the power of 10 that gives 926,000 as theproduct.9 2 6 0 0 0 9. 26 10 5Write each number in scientific notation.The decimal point moves 5 places sothe exponent is 5.7. 5,100 8. 1,840,000The decimal point moves 3 places. The decimal point moves 6 places.65,100 5 . 1 3 10 1,840,000 1 . 84 106.41 10 5 4.73 10 4 8.25 10 6 7.03 10 59. 641,000 10. 47,300 11. 8,250,000 12. 703,000Copyright © by Holt, Rinehart and Winston.21 Holt Middle School Math Course 2All rights reserved.LESSON2-2ChallengeComputer BytesEach byte in a computer’s memory represents about one character.The major units of computer memory are kilobytes (KB), megabytes(MB), and gigabytes (GB).1 kilobyte 1,000 bytes 1 KB 1,000 bytes1 megabyte 1,000 kilobytes 1 MG 1,000 KB1 gigabyte 1,000 megabytes 1 GB 1,000 MBWrite your answers using scientific notation.1. In 1984, many personal computershad 64 KB of active (RAM) memory.How many bytes does this represent?6.4 10 4 bytes3. In 1997, many personal computershad 1 GB of hard drive memory. Howmany bytes does this represent?1 10 9 bytes2. In 1992, many personal computershad 40 MB of hard drive memory.How many bytes does this represent?4 10 7 bytes4. By 2001, many personal computershad 20 GB of hard drive memory.How many bytes does this represent?2 10 10 bytesMing saved his computer files on floppy disks. Each disk holds upto 1.44 MB of memory. He used these disks to transfer his files toanother computer.5. How many bytes could each floppydisk hold?1.44 10 6 bytes6. Ming’s new computer has 12 GB ofmemory. How many disks could hetransfer if each disk held 1.2 MB?10,000 disksRachel decided to back up her hard drive’s computer files bycopying them onto compact disks (CDs). Each CD can hold upto 650 MB of memory, but Rachel saves only 600 MB on each.7. How many bytes could each CDpotentially hold?6.5 10 8 bytes8. If Rachel backs up 6 GB of memory,how many bytes of memory will sheneed?6 10 9 bytesCopyright © by Holt, Rinehart and Winston.22 Holt Middle School Math Course 2All rights reserved.Copyright © by Holt, Rinehart and Winston.133 Holt Middle School Math Course 2All rights reserved.