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i) 157 + 376 + 413 + 524
It can be arranged as ,
= (157 + 413 )+ (376 + 524)
= 570 + 900
= 1470
ii) 23 + 446 + 377 + 54
It can be arranged as ,
= (23 + 377 )+ (446 + 54)
= 400 + 500
= 900
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