LEARNING
OBJECTIVE: Look at estimating answers to calculations / writing numbers to significant figures and decimal Places
SUCCESS
CRITERIA: You will be able to quickly estimate the solution to a problem and also round numbers to significant places and decimal places
STARTER:
TASK 1 - Complete this table by rounding the numbers to the accuracy shown by the heading of each column
Number | Nearest 10 000 | Nearest 1000 | Nearest 100 | Nearest 10 |
45 678 |
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89 675 |
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16 500 |
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22 650 |
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7 986 |
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650 | n/a |
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897 | n/a |
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474 | n/a |
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Task 2: Complete this table by rounding to the number of decimal places shown by the heading of each column
Number | 1dp | 2dp | 3dp | Whole Number |
5.6754 |
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23.6787 |
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0.0785 |
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15.00786 |
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0.0099 |
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99.0909 |
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8.5507 |
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123.5009 |
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LESSON: Answers To above and discussion on Decimal Places / Rounding and significant figures. Emphasise how to use significant figures.
Ex 4d on page 119 - just write answers down WITHOUT a calculator
Examples of using 1 sig fig to help find approximations to the solutions of problems to help avoid making errors when using a calculator
Ex 4E page 121
PLENARY: Checking answers throughout lesson, summary at end of lesson, Exam question from 2009 exam paper
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