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30. 2+3+5=10, 4+6=10, and 2+4+1+1+2=10.
You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).
(10 + 1) x 10/2
The original questions is in parenthesis,71 plus 2 = 10 22 plus 31 =8 111 plus 22 =7(71) 7+1 "plus" 2 (2) = 10, (22) 2+2 (plus) (31) 3+1=8, (111) 1+1+1 "plus" (22) 2+2=7
1 plus 1 x 2 plus 3 x 42 plus 10 x 5 = 1 + 2 + 126 + 50 = 179
1/10+1/2 is the same as 1/10+5/10 which equals 6/10 and can be simplified to 3/5
30. 2+3+5=10, 4+6=10, and 2+4+1+1+2=10.
You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).
1 plus 2 plus 3 plus 4 equal 10. 10 times 5 equals 50.
-11 To calculate this, begin at the left side, then work them in order. -2 -8 = -10 + 3 - 2 + 5 -7 -10 + 3 -2 + 5 -7 -10 + 1 + -2 -9 + -2 = -11
-13
(10 + 1) x 10/2
15 + 15 + (10 * (1 / 2)) + (10 * (1 / 2)) = 40
1 plus 1 is 2. Plus 1 is 3. Plus 1 is 4. Plus 10 is 14. 14.
Group the numbers in pairs. You have ten pairs, each of which is equal to -1 and the ten are to be added together. Total = -10
It equals 10
3 + 5 + 6 + 9 + 2 + 1 + 10 = 36