Mental Calculation Ability Test
		Work each calculation as quickly as you can without using calculator. Your time limit is 3 minutes. You may work the problems in any order.  After you finished in time,you can check the answer right below the problems.    If you are not satisfied your result, then you need  practice this calculation.
	1.   320 / 2.5 =      2.   35 x 35 = 3.   53 x 101 = 4.   278 - 235 =   5.   107 x 103 =    6.   535 - 489 =    7.   51 x 51 =  8.   77 x 11 = 9.   42 x 38 = 10.  36 / 4.5 =
					11.  99 x 75 = 12.  300 / 25 = 13.  5.5 / 110 = 14.  5400 / 50 = 15.  2.9 x 310 = 16.  7 + 34 + 443 + 50 =  17.  3.5 x 18 = 18.  245 - 189 = 19.  360 / 75 = 20.  1 + 2 + 3 + --- + 29 + 30=