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Lesson 7: Decimals as Money

Learn how to perform operations with decimals using money as examples. Understand that decimals represent cents. Practice adding, subtracting, multiplying, and dividing decimals through 12 practice questions.

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Lesson 7: Decimals as Money

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  1. Lesson # 7 Decimals written as money !

  2. When doing operations with decimals… • Think about MONEY !

  3. How much money is $0.05 a) 5 cents b) 5 dollars c) Half a cent d) Or half a dollar ?

  4. If you said… $0.05 is …half a dollar…or half a cent…or 5 bucks……then…

  5. I’m sorry… • You are • W R O N G !!!!!!!!!!

  6. $0.05 is equal to 5 cents.

  7. Another example… • $0.025 is equal to… A) A quarter B) Two and a half cents • Twenty five cents D) Two dollars and fifty cents.

  8. If you said that $0.025 is equal to B) Two and a half cents, then you are right!

  9. So… • When adding, subtracting, multiplying or dividing … • Numbers with DECIMALS….

  10. Think about… Cash MONEY

  11. An example of adding… $0.015 + 0.015 = ?

  12. $0.015 = one and a half cents • Soooooooooo

  13. 0.015 + 0.015 equals… • One and a half cents PLUS one and a half cents… • ( 0.03) Three Cents !

  14. An example of subtracting… • $1.25 – $0.05 = ?

  15. Think… • $1.25 equals one dollar and twenty five cents… • Subtract… • $0.05 (a nickel) • Therefore $1.25 - $0.05 = $1.2 (One dollar and twenty cents)

  16. An example of Multiplying… 0.12 x 2.0 = ?

  17. Convert the “friendliest” number into groups and the other to MONEY!

  18. 0.12 x 2.0 • Make the 0.12 the money (12 cents) • Make the 2.0 the number of groups

  19. That means you have … • Two groups of 12 cents… • Which is 24 cents ( 0.24) !

  20. An example of dividing… • $0.35 ÷ 0.05 = ?

  21. Think… 0.35 (35 cents) ÷ 0.05(5 cents)

  22. How many times would… • Five cents fit into 35 cents?

  23. Seven ? Right !

  24. Lets get ready for 12 practice questions ! • That’s right “12” , • 3 add, • 3 subtract, • 3 multiply and • 3 divide.

  25. Question # 1 0.1 + 0.01 = ?

  26. Question # 2 0.25 – 0.2 = ?

  27. Question # 3 0.5 x 3.0 = ?

  28. Question # 4 0.35 ÷ 0.05 = ?

  29. Question # 5 4.75 + 0.2 = ?

  30. Question # 6 1.5 – 0.75 = ?

  31. Question # 7 0.08 x 5.0 =

  32. Question # 8 1.25 ÷ 0.25 = ?

  33. Question # 9 0.025 + 0.25 = ?

  34. Question # 10 1.1 – 0.03 = ?

  35. Question # 11 25.0 x 0.01 = ?

  36. Question # 12 2.25 ÷ 0.25 = ?

  37. And now the answers… • Get Ready!

  38. Question # 1 0.1 + 0.01 = 0.11

  39. Question # 2 0.25 – 0.2 = 0.05

  40. Question # 3 0.5 x 3.0 = 1.5

  41. Question # 4 0.35 ÷ 0.05 = 7

  42. Question # 5 4.75 + 0.2 = 4.95

  43. Question # 6 1.5 – 0.75 = 0.75

  44. Question # 7 0.08 x 5.0 = 0.4

  45. Question # 8 1.25 ÷ 0.25 = 5

  46. Question # 9 0.025 + 0.25 = 0.275

  47. Question # 10 1.1 – 0.03 = 1.07

  48. Question # 11 25.0 x 0.01 = 0.25

  49. Question # 12 2.25 ÷ 0.25 = 9

  50. The END !

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