1. Which of the following calculations gives the largest answer?
A $1-2+3+4$
B $1+2-3+4$
C $1+2+3-4$
D $1+2-3-4$
E $1-2-3+4$
1. A The values of the expressions are: A 6, B 4, C 2, D -4, E 0 . (Alternative method: since every expression contains the integers 1,2,3 and 4, the expression which has the largest value is that in which the sum of the integers preceded by a minus sign is smallest. This is expression A.)