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Level 4/5 Booster

Learn how to make estimates and use a calculator efficiently by following the BODMAS rule. Practice estimating multiplication and identifying the order of operations. Use mental, written, and calculator methods to solve calculations.

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Level 4/5 Booster

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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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