7+3+10 = 20
The sum of -10 and -7 is -17.
10
3+7 = 10
The sum of 7 plus 71 is 77.
The sum of 7/10 and 4/15 = 29/30
The estimated sum is 11 The actual sum is 10 and 19/24
SUM means plus 4+7=11
the sum of 10 + 10 = 20
The sum of 10 plus 8 is 18.
The sum of 1/8 and 7/10 is 33/40
13