`28,3 × 45 + 28,3 × 54 + 2,83× 10`
`= 28,3×45 + 28,3×54+28,3`
`= 28,3 × (45+54+1)`
`= 28,3 × 100`
`=2830`
`45,28 + 2,17 + 54,72 +7,83`
`= (45,28+54,72)+(2,17+7,83)`
`= 100 + 10`
`= 110`
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