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125x8=(125x2)+(125x2)+(125x2)+(125x2)=250+250+250+250=500+500=1000
b)38x25=(30x20)+(8x20)+(30x5)+(8x5)=600+160+150+40=760+190=950
58x11=(50x10)+(8x10)+58=500+80+58=580+58=638
7.
a)36x74=2590+74=2664
b)35x75=2590+35=2625