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Estimation and Approximation

Estimation and Approximation. Estimation and Approximation. YOU will Recap on rounding off a number to the required degree of accuracy. State the rules for writing significant figures. Round off a number to the required number of significant figures. Estimation and Approximation.

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Estimation and Approximation

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  1. Estimation and Approximation

  2. Estimation and Approximation YOU will • Recap on rounding off a number to the required degree of accuracy. • State the rules for writing significant figures. • Round off a number to the required number of significant figures.

  3. Estimation and Approximation How many oranges are there in the picture?

  4. Estimation and Approximation . Estimatehow many smses do YOU usually send in a month?

  5. Approximation The rules for rounding off are: • If the next number is 5 or more, round up. • If the next number is 4 or less, round down.

  6. Approximation • Example 1 • Round off $10.46 to the nearest 10 cents • We will look at the nearest cent $10.46 • 6- rounding up (5 or more) $10.46$10.50 • Example 2 • Round off $4.33to the nearest 10 cents • We will look at the nearest cent $4.33 • 3- round downing(4 or less) $4.33$4.30

  7. Approximation • Turn to page 56 of your textbook and refer to example 1 and 2. • Do out the ‘Try It 1 and 2’ questions of your textbook. • Turn to page 58 of your textbook and refer to example 3 and 4. • Do out the ‘Try It 3 and 4’ questions of your textbook.

  8. Significant figures Refers to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation. • 3 RULES • Non-zero digits are always significant. • Any zeros between two significant digits are significant. • All zeros at the end of a decimal, after the first non-zero digit.

  9. Approximation • Turn to page 62 of your textbook and refer to example 5 and 6. • Do out the ‘Try It 5 and 6’ questions of your textbook. • Turn to page 63 of your textbook and refer to example 7. • Do out the ‘Try It 7’ questions of your textbook.

  10. This Cute Teddy Bear here will like you to do this as homework in book Exercise 3.1 – Qns 1 to 6 Qns 10a,10b,10c Qns 12 • Exercise 3.2 – Qns 1 to 4 Qns 6

  11. WORLD WAR II IN SINGAPORE in 1942

  12. Estimation and Approximation • During War World II, Food and medical supplies were dangerously low, partly because shipping was in total disarray. • Protect yourself against EMERGENCIES! • It is important to stock up groceries for wartime

  13. STOCK UP All the discounted item for the week from NTUC! • Round off to the nearest dollar for each item • Estimate the total price of all the items without calculator in • 2 minutes.

  14. A StORY…… • A group of Civil Engineers were at a conference being held in Central Australia. As part of the conference entertainment, they were taken on a tour of the famous rock, Uluru. • "This rock", announced the guide, "is 50 000 004 years old." • The engineers - always impressed by precision in measurement - were astounded. "How do you know the age of the rock so precisely?" asked one of the group. • "Easy!", came the reply. "When I first came here, they told me it was 50 million years old. I've been working here for • 4 years now."

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