Reading Tables. The following table shows information about the seven continents of the world.

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1 4 G r a p h s a n d S t a t i s t i c s Reading Tables Mathematical information is often organized in tables so that it is easy to understand. Tables can help us see certain trends and predict what to expect in the future. The following table shows information about the seven continents of the world. CONTINENT AREA IN POPULATION POPULATION ESTIMATED MI IN 00 PER MI POPULATION IN 05 North America 9,40,000 49,000, ,000,000 South America 6,870, ,000, ,000,000 Europe 3,85,000 79,000, ,000,000 Asia 7,085,000 3,785,000,000 4,766,000,000 Africa,685,000 84,000,000 7,73,000,000 Australia and Oceania,968,000 3,000,000 40,000,000 Antarctica 5,00,000 Uninhabited Uninhabited Uninhabited Use the table to answer the following questions.. Which continent is the largest in area?. Which continent is the largest in population? 3. List the continents in order from least people per square mile to most people per square mile. 4. Which continent is expected to have fewer people in 05 than in 00? 4

2 Lesson 4 We R e m e m b e r Follow the directions. 5. Name two acute angles. and J 6. Name two straight angles. and 7. Name two obtuse angles. and I P 8. Name one right angle. F G H Q Solve and check. 9. a. 0 = n 4 b. c. n + 6 = 7 d. Round to the nearest ten to estimate. Then copy and solve. 0. a b = = Convert to decimals. Write repeating decimals with a bar a. = b. = 5

3 Lesson x S k i l l B u i l d e r s Write the repeating decimal with a bar a. = b. 4 = c. 5 8 ) a b. 9 6 c ,7 8 3 Complete the sentences. 4. A trapezoid has only pair of sides. 5. Figure is a trapezoid. M a s t e r y D r i l l 6. a. fluid ounce = tablespoons b. cup = fluid ounces 7. a. cubic centimeter = milliliter b. A straight angle has. 8. An obtuse angle measures between and. 9. An acute angle measures between and. 0. An isosceles triangle has congruent sides.. An equilateral triangle has congruent sides.. A scalene triangle has congruent sides. 3. The four angles made by two intersecting lines measure a total of. 6

4 Lesson 4 Solve. Cancel where possible a. 4 = b. = c. 5 = Classify each triangle as equilateral, isosceles, or scalene. 5. a. b. c. 6. Nellie couldn t see the chalkboard at school so her mother took her to the optometrist. Her eye exam cost $ Corrective lenses cost $65.00, and the frames cost $ Nellie s mother also decided to buy a case for an extra $.00, so that Nellie could protect her glasses when she was not wearing them. What was the total cost of correcting Nellie s vision? The retina of the human eye has cells called rods and cones, which absorb light rays and change them into electrical signals. Each retina has about 0 million rods and about 6 million cones. Use the table to answer the questions. 7. What was the most frequent cause of fatal accidents due to improper driving? 8. Add the percents together. Did you get 00%? 9. What do you think might be other causes of fatal accidents that aren t listed here? Fatal Accidents Due to Improper Driving Type of Improper Percent of Fatal Driving Road Accidents Unsafe speed 3% Failure to yield right of way 9% Disregard signal 5% Failed to stop at stop sign 4% Drove to the left of the center line 6% Made an improper turn % Followed another vehicle too closely 0.5% 7

5 5 Quiz Tell your teacher when you are ready to take Quiz. Fa s c i n a t i n g D i s c o v e r i e s Perfect Numbers Six is often called a perfect number because its factors smaller than itself (,, and 3) when added together also make 6 ( = 6). Find out if the following numbers are perfect by doing the work below.. List all the factors of 8 smaller than itself.. Find the sum of the factors of Is 8 a perfect number? 4. The factors of 4 smaller than itself are,, 4, 3, and 6. Find the sum of the factors of Is 4 a perfect number? 6. The factors of 496 smaller than itself are,, 4, 8, 6, 3, 6, 4, and 48. Find the sum of the factors of Is 496 a perfect number? 8 Ancient Greek mathematicians found the first four perfect numbers. They are 6, 8, 496, and 8,8.

6 6 Converting Decimals to Fractions and Mixed Numbers Decimals can be changed to fractions or mixed numbers. Many of these fractions can be reduced to simpler form = =.9 = = 5 = 5 0. = = 5 834, = = , = 4 = Rewrite each decimal as a fraction or mixed number with a denominator of 0, 00, or,000. Reduce to simplest form if necessary. The first one is done for you. 5. a. 0.5 = 00 = 4 b. 0.3 = = c. 3.6 = =. a. 5.5 = = b = = c = = We R e m e m b e r Round to the nearest hundred. a b thousandth. a b

7 Lesson 6 The Speed of Sound in Various Substances Feet Meters Substance per second per second Air at 59,6 340 Brick,980 3,650 Distilled water at 77 F 4,908,496 Seawater at 77 F 5,03,53 Wood 3,480 4,0 Sound travels through the air at,6 ft per second at 59 F. If the air temperature rises to, sound travels at,68 ft per second. Use the table to answer the questions. 5. What is the speed of sound through air at 59? Give your answer in meters per second. 6. How much faster per second will sound travel through seawater than through distilled water? Give your answer in feet per second. 7. The speed of sound waves in air at 5 C is 340 meters per second. Sound moves,53 meters per second through seawater at 5 C. How much faster does sound travel through seawater than through air? Set up a proportion to find each answer. 8. a. ft = in b. 5 yd = ft Substitute 9 for w and for y. Simplify the expressions. 9. a. 8 y 7 w b. w y c. w 6 + y d. 4 + w y 0

8 Lesson 6 Answer the questions about figures and. 0. The sum of all the angles in each figure is. Z Z. Underline the correct word: AE and DC are parallel, intersecting, perpendicular.. ABD is congruent to. 3. Measure ABC. 4. Name the angle that is congruent to ABC. 5. Name two straight angles from figure. 6. Name two acute angles from figure. 7. Name two obtuse angles from figure. figure V Y A C X figure B W Z D E + - x S k i l l B u i l d e r s Write the repeating decimal with a bar. 3, a..7 b c. 8 ) 5 Write these numbers. 9. Negative three hundred twenty-six 0. Five million, four hundred thirty-two thousand, nine hundred eighty-one.

9 Lesson 6 M a s t e r y D r i l l. A straight angle has.. A scalene triangle has congruent sides. 3. An isosceles triangle has congruent sides. 4. An equilateral triangle has congruent sides. 5. An obtuse angle measures between and. 6. An acute angle measures between and. 7. Sound waves strike your eardrum. Your eardrum is a thin, round membrane about 0 mm in diameter. What is the circumference of your eardrum? 0 mm 8. The speed of sound through air is,6 feet per second. A jet plane traveling at the speed of sound is described as Mach. Twice the speed of sound is Mach. How fast is the jet traveling at Mach? Use <, >, or =. 9. a. - - b c d Use the chart to convert the metric units. kilo hecto deca deci centi milli 30. a. 4,735 g = kg b. 0.5 kg = g c. 3 g = mg Rewrite each decimal as a fraction or mixed number with a denominator of 0, 00, or,000. Reduce to simplest form. 3. a. 5.8 = = b = = c..35 = =