-1
add 9 plus 5 than subtract 1 from 5 to add it to 9 will give you 10
2.9 would be 2 9/10. To make that into a fraction, just make the 9 9 tenths (9/10), and add the 2 in front of it.
out of 10 10 10 put a line through the middle 1 to make 10 to 10 = 9:50
It can be done as: -10+1^5 = -9
1 and 9
10 - (-9) = 19
19
take 1 ml, add 9 ml water.
You will add -3 to 9 to make it 6.
18
4 = 3 + 1 so 4 + 9 = (3 + 1) + 9 Then, by the associative property, = 3 + (1 + 9) = 3 + 10 = 13
When you add -9 and +10, you get (+) 1.