Answer:

1.-11/60

2. -5

3.2/3

4. 20/21 of 7/10 is greater

Step-by-step explanation:

1. -2/5 × 1/3 + -3/16 × 4/-15

= -2/15 + 1/20

= (-8+3)/60

= -11/60

2. -4/5 × 5/1 - 2/3 × 9/-6

( after all cancellation)

=-4-1

= -5

3. (-3/7 × 7/5 ) - ( -6/10 × -1/3) + (3/5 × -10/9)

= (-3/5) - (-1/5) + (-2/3)

= -3/5 + 1/5 - 2/3

= ( -45+45-50)/75

= -50/75

= 2/3

4. -7/3 of 2/9 ; 20/21 of 7/10

-7/27 ; 2/3

-0.25 < 0.666667