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Mastering Calculator Skills with BODMAS: Estimations and Operations

In this lesson, students will learn how to make and justify estimates and approximations in calculations using calculators. They will explore the BODMAS rule to perform operations accurately and efficiently. Activities include estimating answers on a target board, applying the BODMAS rule in equations, and identifying the order of operations. With practice in both mental and calculator methods, students will enhance their computational skills, leading to improved accuracy in mathematical tasks.

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Mastering Calculator Skills with BODMAS: Estimations and Operations

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  1. Level 4/5 Booster Lesson 4B Using a Calculator

  2. Objectives: • Make and justify estimates and approximations to calculations. • Use a calculator efficiently and effectively using BODMAS. Vocabulary: enter memory calculator display

  3. W/S 4.1B Estimate the answer to each multiplication in the target board and find an answer to match in the ovals around the edges. 16 12 2.1 x 3.9 4.2 x 3.8 9.9 x 5. 2 8 31 x 49 2.99 x 4.11 19.9 x 20.1 1000 10.01 x 99 2.7 x 5.3 9.9 x 9.1 15 1500 90 400 50

  4. Answers: 2.1 x 3.9 4.2 x 3.8 9.9 x 5. 2 16 50 8 31 x 49 2.99 x 4.11 19.9 x 20.1 12 400 1500 10.01 x 99 2.7 x 5.3 9.9 x 9.1 15 1000 90

  5. 4 + 2 x 5 = 14 4 + 2 x 5 = 14 4 + 2 x 5 = 14 Identify the order of the operations in the equations below – colour the operation (+ - x or ÷) box as given in the key. 1st 2nd 3rd Example: Remember BODMAS rule.

  6. 1st 3rd 2nd 4 3 2 = 14 x + 2 4 2 = 10 + x 4 5 3 = 17 - x 3 4 2 1 = 12 + + x 2 3 3 4 = 7 + x - - 4 1 2 6 = 15 + x W/S4.2B

  7. Answers: 4 3 2 = 14 x + 2 4 2 = 10 + x 4 5 3 = 17 - x 3 4 2 1 = 12 + + x 2 3 3 4 = 7 + x - - 4 1 2 6 = 15 + x M4.2(B)

  8. Remember the BODMAS rule to find the answers to the questions below. ( 3 + 2 ) x 4 = 3 x 2 + 7 = ( 4 + 3 ) x 3 = 2 x ( 3 - 1 ) = 3 + 4 x 2 - 1 = 17 x ( 5 - 4 ) = M4.3B

  9. Remember the BODMAS rule to find the answers to the questions below. ( 3 + 2 ) x 4 = 20 3 x 2 + 7 = 13 ( 4 + 3 ) x 3 = 21 2 x ( 3 - 1 ) = 4 3 + 4 x 2 - 1 = 10 17 x ( 5 - 4 ) = 17 M4.3(B)

  10. ( 32 + 37 ) x 14 = 23 x 6 + 71 = ( 46 + 78 ) x 32 = 24 x ( 35 - 17 ) = 17 + 43 x 6 - 7 = 17 x ( 15 - 4. 8 ) = M4.4B

  11. ( 32 + 37 ) x 14 = 966 209 23 x 6 + 71 = ( 46 + 78 ) x 32 = 3968 24 x ( 35 - 17 ) = 432 17 + 43 x 6 - 7 = 268 17 x ( 15 - 4. 8 ) = 173.4 M4.4(B)

  12. For each of the questions below show clearly whether you used a mental, written or calculator method: • (7.3 + 2.7) x 4.3 b. 12 x 9 – 13 x 7 • c. 38.4 ÷ (2.9 + 3.5) d. (2.7 + 8.5)² - 12.93 • 4.2 + 6.4 x 8 f. 3.8² + 6 • 18 – 7 x 2 5² • g. 140.4 ÷ ( 4.8 + 2.6 + 1.5) W/S4.5B

  13. Answers: • (7.3 + 2.7) x 4.3 = 10 x 4.3 = 43 • 12 x 9 – 13 x 7 = 108 – 91 = 17 • 38.4 ÷ (2.9 + 3.5) = 6 • (2.7 + 8.5)² - 12.93 = 112.51 • 4.2 + 6.4 x 8 = 13.85 • 18 – 7 x 2 • f. 3.8² + 6 = 0.8176 • 5² • g. 140.4 ÷ (4.8 + 2.6 + 1.5) = 15.775 (to 3 d.p.) mentally written calculator calculator calculator calculator calculator

  14. Objectives: • Make and justify estimates and approximations to calculations. • Use a calculator efficiently and effectively using BODMAS. Vocabulary: enter memory calculator display

  15. Thank you for your attention

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