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Question

Add.
(i) 613+213

(ii) 114+312

(iii) 515+217

(iv) 315+213


Solution

(i) 
613+213=6×3+13+2×3+13=18+13+6+13=193+73
=19+73=263=24+23
=243+23=8+23=823

(ii) 
114+312=1×4+14+3×2+12=54+72=54+7×22×2
=54+144=5+144=194=16+34
=164+34=4+34=434

(iii) 
515+217=5×5+15+2×7+17=265+157=26×75×7+15×57×5
=18235+7535=182+7535=25735
=245+1235=24535+1235=7+1235=71235
(iv) 315+213
315+213=3×5+15+2×3+13=165+73=16×35×3+7×53×5
=4815+3515=48+3515=8315
=75+815=7515+815=5+815=5815

Mathematics
Mathematics (Solutions)
Standard VI

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