Presentation top top theme: "Quick testimonial Round come the location value that the underlined digit:"— Presentation transcript:




You are watching: Round to the place of the underlined digit

1 Quick review Round to the location value of the underlined digit:, 528 ,295 ,000 Answers: 3,500 130,000 200,000 1,000

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2 Using estimation StrategiesSection 1-1 (pages 5-9)

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3 estimate or Exact? mean you space writing a news article. Your notes contain some data that might be estimates. For each situation, decision whether you have actually an estimate or precise value. Define your decision. A) The populace of Florida is 16,000,000. B) Florida has 25 to represent in the U.S. Residence of Representatives. Estimate precise Value other examples??

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4 Things to Remember… estimate a number before you calculate itUse the symbol which means “approximately same to”

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5 Estimating a amount or DifferenceAt the zoo, you see a Colombian black color spider monkey. The length of its human body is cm. The length of that tail is cm. Come the nearest tenth of a centimeter, estimate the total length the the monkey’s body and tail. ring to nearest tenth 137.3 cm include

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6 Estimating a Product A rectangular kitchen is 8.5 ft long and also 5.75 ft wide. Usage rounding to calculation the area the the kitchen in square feet. ring each element to the nearest entirety number 9 * 6 = ft2 multiply

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7 Extra practice Estimate. Round to the nearest whole number before you include or subtract 1) 2) 3) 4) 11 3 19 8

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8 Extra practice Estimate. Ring to the nearest entirety number prior to you multiply. 1) 4.9 x 12.2 2) 6.07 x 3.29 3) 7.65 x 5.33 4) x 4.79 60 18 40 125

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9 Estimating by Front-End EstimationUseful because that finding sums or differences. 2 Steps: 1) include (Subtract) the front numbers 2) estimate the sum of the lesser numbers and adjust the estimate

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10 Estimating by Front-End EstimationSuppose you went food shopping with your parents this weekend and bought happy Charms because that $3.21, a frozen pizza for $4.79, Pepsi because that $1.99, and also a load of gum because that $1.15. Estimate the total cost of her purchases. Action 1: add the front-end digits $3.21 $4.79 $1.99 +$1.15 $9 step 2: estimate the total amount of cent to the nearest dollar. $3.21 $4.79 $1.99 +$1.15 $2 about $1 around $1 The complete cost is around $11.

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11 Step 1: include the front-end digitsExtra practice A group of runners operation a relay race in i m sorry each jogger decides just how long they operation for. Their ranges were 3.9 miles, 2.1 miles, 1.7 miles, 1.2 miles, and 3.3 miles. Calculation the total distance of the race. Step 1: add the front-end number 3.9 2.1 1.7 1.2 + 3.3 10 step 2: estimate the complete amount of one per 10 of a mile to the nearest mile. 3.9 2.1 1.7 1.2 + 3.3 2 around 1 around 1 The total distance is around 12 miles.

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12 Extra practice Use Front-End estimation to estimate each sum.1) 2) 3) 4) 8 19 13 6

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13 What is a compatible number?Numbers that are basic to compute mentally. You can use compatible number to estimate. Readjust the number of the trouble to do the calculate easier. Useful for detect quotients.

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14 Using Compatible NumbersIt take it pounds of shredded cheese to do the world’s biggest burrito. Use compatible number to calculation how plenty of 10 pound boxes that shredded cheese the cooks needed.

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75.75 10 collection up the Quotient 80 10 pick compatible number such as 10 and also 80.

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15 Extra exercise Use compatible number to estimate each quotient.1) 76.5 ÷ 8.8 2) ÷ 4.92 3) ÷ 9.72 4) 32.2 ÷ 7.56 9 4 10 4

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