pages 38, 41 13 9 32 6 23 19 93 28 72 56 – – – – – 24 - 8 21 8 51 48 76 39 81 27 – – – – 61 8 13 7 34 27 57 18 63 28 – – – – – 43 9 43 7 236 188 337 - 159 223 219 – – – – 44 8 3456 - 687 63 - 28 351 348 5.7 2.9 – – – 61 - 7 71 39 435 - 427 8.42 0.17 9.3 2.8 – – – 84 59 13.23 8.54 7.6 3.9 43 17 5.14 4.6 – – – – – 42 19 4.1 2.03 62 16 2 - 0.7 5.75 1.85 – – – – 50 28 47 28 3.4 1.25 0.236 0.188 QUESTIONS: – – – – 134 99 83 37 9.15 7.5 you think about it as – – – 6 minus 3 or 600-300? 247 -98 91 26 – How do you 315 97 84 - 36 – know that 30 70 is 468 99 QUESTIONS: – negative 40? How did you decide what 3.63 1.95 – to take away? 3.6 1.95 QUESTIONS: – Why did you want to 3.63 1.9 How did you decide your – break the numbers first move? apart? Did anybody use this Did anyone break the QUESTIONS: strategy but make subtrahend apart in a How do you know the QUESTIONS: different different way? distance is the same How do you know what Why did you take [200] between the numbers? the answer is? away instead of [198]? Why did you to Did you take away too ____? many or too few? Did anyone use this Why did you add [2] same strategy in a twice? different way?
pages 38, 41 13 – 9 24 - 8 61 – 8 43 – 9 32 – 6 21 – 8 13 – 7 43 – 7 44 – 8 61 - 7 23 – 19 51 – 48 34 – 27 93 – 28 76 – 39 57 – 18 236 – 188 3456 - 687 72 – 56 81 – 27 63 – 28 337 - 159 223 – 219 351 – 348 435 - 427 63 - 28 71 – 39 84 – 59 42 – 19 50 – 28 5.7 – 2.9 8.42 – 0.17 13.23 – 8.54 4.1 – 2.03 9.3 – 2.8 7.6 – 3.9 5.75 – 1.85 0.236 – 0.188 43 – 17 62 – 16 47 – 28 83 – 37 91 – 26 84 - 36 5.14 – 4.6 2 - 0.7 3.4 – 1.25 9.15 – 7.5 QUESTIONS: you think about it as 6 minus 3 or 600-300? How do you know that 30 70 is negative 40? 134 – 99 247 -98 315 – 97 468 – 99 QUESTIONS: How did you decide what to take away? Why did you want to break the numbers apart? Did anyone break the subtrahend apart in a different way? 3.63 – 1.95 3.6 – 1.95 3.63 – 1.9 QUESTIONS: How did you decide your first move? Did anybody use this strategy but make different How do you know what the answer is? QUESTIONS: How do you know the distance is the same between the numbers? Why did you to ____? Did anyone use this same strategy in a different way? QUESTIONS: Why did you take [200] away instead of [198]? Did you take away too many or too few? Why did you add [2] twice?