Calculate : `1-2+3-4+5-6+7-8++19-20`

Calculate : 1-2+3-4+5-6+7-8+9-10

Calculate: 1-2+3-4+5=6+7-8++49-50.

Evaluate : (i) (3)/(4)-(4)/(5) (ii) -3-(4)/(7) (iii) (7)/(24)-(19)/(36) (iv) (14)/(15)-(13)/(20) (v) (4)/(9)-(2)/(-3) (vi) (7)/(11)- (-4)/(-11) (vii) (-5)/(14) -(-2)/(7) (viii) (-5)/(-8)-(-3)/(4)

What should come next in the following series? 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 7 6 5 4 3 2 1 1 2 3

Calculate mode from the following series : {:("Size",1,2,3,4,5,6,7,8,9,10,),("Frequency",8,6,10,12,20,12,5,3,2,4,):}

convert each of the following fractions into a per centage : (1) 47/100 (2) 9/20 (3) 3/8 (4) 8/125 (5) 19/500 (6) 4/15 (7) 2/3 (8) 1.3//5

The given numerals and answer the following questions. 4 5 3 6 4 6 7 3 6 5 4 2 3 4 5 3 6 4 2 3 5 7 8 3 6 7 3 2 1 2 3 5 3 6 5 6 7 3 6 7 3 6 4 1 2 5 4 3 6 How many 7's are followed 3 and preceded by 6?