ANSWER KEY
PAGES 2-3: NUMBERS IN THE NEWS
PAGES 10-13: PLUTO: KING OF DWARFS 1a. D 1b. 2 states of Kansas 2a. A and C 2b. 113 islands of Manhattan 3a. B 3b. 24.5 times larger
I Heart My Robo-Pet: $570 Motorcycle Surfer: 1.5 hours Record-breaking Feet: Answers will vary.
PAGES 4-7: RECYCLING ROLLER COASTERS
1a. 2 1 1b. 0.5 2. 0.2 3. 0.25 4. 0.4 5. 0.1
4a. B and D 4b. 17 days 5. 310 Earth years
PAGES 14-15: BOT BUILDERS 1a. 2 x 30 points = 60 points 1b. 20 points 1c. 60 + 20 = 80 points 2a. 3 x 7 = 21 points 2b. 2 x 3 = 6 points 2c. 21 + 6 = 27 points 3. 2(60) + 40 + 4(7) = 188 points 4. 10(3) – 8 = 22 points 5. 3(20) + 6(7) – 2(8) = 86 points
PAGES 8-9: KIDS WHO CODE 1a. l = 1 inch w = 4 inches 1b. P = 2(1) + 2(4) = 10 inches 2. A = 1.5 inches x 1.5 inches = 2.25 square inches 3a. w = 1.25 x 72 pixels = 90 pixels l = 0.25 x 72 pixels = 18 pixels 3b. P = 2(90) + 2(18) = 216 pixels 3c. A = 90 pixels x 18 pixels = 1,620 sq. pixels 4a. Area of box A = 1.5 inches x 0.5 inches = 0.75 square inches = 0.8 square inches 4b. Area of box B = 1 inch x 1.25 inches = 1.25 square inches 5. l = 1.25 x 72 pixels = 90 pixels
PAGE 16: THE PUZZLE PAGE MATH MASTER 1. A 2. B 3. D 4. B 5. C MATH BLOOPER: Floppy did not multiply 7 x 2 when calculating perimeter. The correct equation is: P = 2(15) + 2(7) = 44 tulips BRAINTEASER: 20 students
w = 1 x 72 pixels = 72 pixels P = 2(90) + 2(72) = 324 pixels
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T12 DYNAMATH TEACHER’S GUIDE
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