Mystery Math Mistake
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| Topic | Big Idea | Video Link |
|---|---|---|
| Adding within 100 | When decomposing, find D.C.’s error when adding 38 + 15. | Open Video |
| Adding within 100 | When decomposing, find D.C.’s error when adding 29 + 58. | Open Video |
| Adding within 100 | Using compensation, find Abracus’s error when adding 19 + 21 | Open Video |
| Adding within 100 | Using compensation, find Abracus’s error when adding 25 + 27 | Open Video |
| Adding within 100 | Using partial sums, find Value Pak’s error when adding 43 + 56. | Open Video |
| Adding within 100 | Using partial sums, find Value Pak’s error when adding 56 + 37. | Open Video |
| Subtracting within 100 | Using an open number line, find Springling’s error when subtracting 56 - 27. | Open Video |
| Subtracting within 100 | Using an open number line, find Springling’s error when subtracting 84 - 46. | Open Video |
| Adding within 100 | When decomposing, find D.C.’s error when adding 48 + 13. | Open Video |
| Adding within 100 | When decomposing, find D.C.’s error when adding 76 + 14. | Open Video |
| Subtracting within 100 | Using an open number line, find Springling’s error when subtracting 82 - 37. | Open Video |
| Subtracting within 100 | Using an open number line, find Springling’s error when subtracting 97 - 48. | Open Video |
| Adding within 100 | On T-Pops’ Place Value Mat, use the traditional method to solve 78 + 14 while attending to place value. | Open Video |
| Adding within 100 | On T-Pops’ Place Value Mat, use the traditional method to solve 64 + 27 while attending to place value. | Open Video |
| Subtracting within 100 | On T-Pops’ Place Value Mat, use the traditional method to solve 62 - 36 while attending to place value. | Open Video |
| Subtracting within 100 | On T-Pops’ Place Value Mat, use the traditional method to solve 85 - 29 while attending to place value. | Open Video |