Add to 1,000 with 1 Regrouping 3-12
Add 3-digit numbers with 1 regrouping. What's 382+145? Use Base 10 discs to model expanded form. Find and add partial sums to get the total sum. 300+100 = 400, 80+40 = 120, and 2+5 = 7. Shift 100 from 120 to 400. Since 500+20+7 = 527, 382+145 = 527. Start with Base 10 discs and progress to using number bonds.
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