we have
498.258
Remember that
498.258=498+0.258
498=400+90+8=4(100)+9(10)+8(1)
0.258=0.200+0.050+0.008=2(0.100)+5(0.010)+8(0.001)
therefore
498.258=4(100)+9(10)+8(1)+ 2(0.100)+5(0.010)+8(0.001)
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