16.2 × 99 + 16.2
= 16.2 × (99 + 1)
= 16.2 × 100
= 1620
( 2.375 + 0.625)× 0.28
= 3 × 0.28
= 3 × (0.3 - 0.02)
= 3 × 0.3 - 3 × 0.03
= 0.9 - 0.09
= 0.81
64 - 2.6 × 0.5
= 64 - 1.3
= 64 - 1 - 0.3
= 63 - 0.3
= 62.7
17 / 20 + 1 / 10 - 9 / 20
= (17 / 20 - 9 / 20)+ 2 / 20
= 8 / 20 + 2 / 20
= 10 / 20
= 1 / 2
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