a)
(- 5/16) × (+8/25) =
( - ) × ( +) = ( - )
= - 5/16 × 8/25 =
= - 8/16×5 =
= - 1/2×5 =
= - 1/10
b)
(-12/25) × (+15/16) =
= - 12/25 × 15/16 =
= - 3 × 3/5 × 4 =
= - 9/20
c)
(-16/21) × (-35/32) =
( - ) × ( - ) = ( + )
= 16/21 × 35/32 =
= 2 × 5/3 × 4 =
= 10 / 12 =
= 5/6