Half is the same thing as .5 so you divide 30 by .5 and you get 60 then you add 10 so it is 70. TADA!!!
30/0.5=60 60+10=70
Seventy. 30 / .5 = 60; 60 + 10 = 70.
40
The answer is: 20/2 plus 30 = 40
28
30/0.5=60 60+10=70
Seventy. 30 / .5 = 60; 60 + 10 = 70.
40
25
By using the 30's and 50's common factors, which are 1, 2, 5, 10.
12
b ./
The answer is: 20/2 plus 30 = 40
28
40
30 / 2 + 10 - 2 = 23
40