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Comparing Equations - PowerPoint PPT Presentation

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Comparing Equations
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  1. Comparing Equations Addition and Subtraction By: Stacy L. Weber

  2. 54+62 ___ 44+72 116 = 116 Think 44 is ten less than 54 but 72 is 10 more than 62. 25+89 ___ 28+91 114 < 119 You should notice that both addends in the right equation are greater than the addends in the left equation, so the left equation is less than the right equation. 36+45 ___ 62+27 81 < 89 If you round and add the numbers you get 90 on each side, so you must find the sum of both equations. 28+61 ___ 22+59 89>81 If you round the equations you get 90 for the left and 80 for the right. Be careful when you round, you need to THINK if you are rounding up or down and how that will affect your actual sum!!!! >, <, or =

  3. 98-56 ___ 78-41 42>37 You know the difference for the left equation will be greater because both of the numbers in the right equation decreased. 84-23 ___ 74-13 61=61 You know these equations will be equal because both numbers in the right equation decrease by 10. >, < or =

  4. 62-22 ___ 39+27 40<66 You can determine this by rounding. 35+41 ___ 89-23 76>66 You can round, but make sure to add and subtract to confirm your answer. 43+16 ___ 56-25 59>31 87-45 ___ 67+25 42=92 You can actually use number sense for both of these equations. You can also round, but make sure to add and subtract to confirm your answer. >, <, or =

  5. 68 + ___ > 78 + 11 45 + 23 > 32 + ___ 59 + 24 < ___ + 36 67 - 24 = 57 - ___ 87 - 32 < 65 - ___ 68 - ___ < 79 - 45 96 - 63 > ___ - 54 52 + ___ > 98 -43 What will make the equation true?