subrtract by writing in columns fast
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11.(4+8) + ( 43+30) = 12 .73
12. (9 + 14) + ( 36 +24) = 23.60.
13. (8 +17) + ( 48+30) = 25.78
14. ( 6+8) + ( 44+12) = 14. 56.
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