Условие:

Вычисли удобным способом.
35 + 2 + 48 + 5;
27 + 54 + 3 + 16;
89 + 7 + 1 + 3;
18 + 24 + 26 + 22.

35 + 2 + 48 + 5 = (35 + 5) + (2 + 48) = 40 + 50 = 90
 
27 + 54 + 3 + 16 = (27 + 3) + (54 + 16) = 30 + 70 = 100
 
89 + 7 + 1 + 3 = (89 + 1) + (7 + 3) = 90 + 10 = 100
 
18 + 24 + 26 + 22 = (18 + 22) + (24 + 26) = 40 + 50 = 90