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Use Base 10 discs to subtract 3-digit numbers with no regrouping. What's 597-473? Subtract same units – hundreds, tens, and ones. 500-400 = 100, 90-70 = 20, and 7-3 = 4. Add the 3 partial differences to get the total difference. Since 100+20+4 = 124, 597-473 = 124. Transition to number bonds and equations.