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Level 4/5 Booster Lesson 4B Using a Calculator

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**enter memory calculator display Objectives:**

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

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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

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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

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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: 4 + 2 x 5 = 14 4 + 2 x 5 = 14 4 + 2 x 5 = 14 Remember BODMAS rule.

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

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Answers: = 14 x + = 10 + x = 17 - x = 12 + x + = 7 + x - = 15 - + x M4.2(B)

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**Remember the BODMAS rule to find the answers to the questions below.**

( ) x 4 = 3 x = ( ) x 3 = 2 x ( ) = x = 17 x ( ) = M4.3B

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**Remember the BODMAS rule to find the answers to the questions below.**

( ) x 4 = 20 3 x = 13 ( ) x 3 = 21 2 x ( ) = 4 x = 10 17 x ( ) = 17 M4.3(B)

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( ) x 14 = 23 x = ( ) x 32 = 24 x ( ) = x = 17 x ( ) = M4.4B

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( ) x 14 = 966 209 23 x = ( ) x 32 = 3968 24 x ( ) = 432 x = 268 17 x ( ) = 173.4 M4.4(B)

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For each of the questions below show clearly whether you used a mental, written or calculator method: ( ) x 4.3 b. 12 x 9 – 13 x 7 c ÷ ( ) d. ( )² x 8 f. 3.8² + 6 18 – 7 x ² g ÷ ( ) W/S4.5B

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Answers: ( ) x 4.3 = 10 x 4.3 = 43 12 x 9 – 13 x 7 = 108 – 91 = 17 38.4 ÷ ( ) = 6 ( )² = x 8 = 13.85 18 – 7 x 2 f. 3.8² = 5² g ÷ ( ) = (to 3 d.p.) mentally written calculator calculator calculator calculator calculator

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**enter memory calculator display Objectives:**

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

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**Thank you for your attention**

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