8 times 2 equals 16 20 minus 16 equals 4 4 minus 2 equals 2 double precision; 2 divided by 2 equals 1 sheet; 8 minus 1 equals 7.

2, 524 minus 64 equals 460 pages, and 460 times 10/ 1 equals 46 pages.

3. Solutions; Suppose there are y students in grade two.

Y plus 5/4y equals 324.

5/9y equals 324.

Y equals 324 divided by 5/9.

Y is equal to 180.

4.4200 times 10/ 1 equals 420 yuan 4200 minus 420 equals 3780 yuan.

5. 10 divided by 3/2 equals 15. 15 divided by 5/3 equals 25.