130 ×60= 630÷30= 900 ÷30 =
580×0= 45 ×20 = 8 ×108=
25 ×80= 720 ÷80 = 99 ×71≈
352 ÷60≈
1.6×50= 6.3÷0.1= 1﹣= -×=