Topic 1-3 Numeration

3rd 2014-15. 3rd Grade Math. Topic 1-3 Numeration: Week 1-5: Domains: ... They also understand that by convention if a number is exactly at the halfway point of the two possible answers, the number is rounded up. ... A student may use the number line above to describe his/her thinking, “231 + 9 = 240 so now I need to add 70 more. 240, 250 (10 ... ................
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