23456 + 758 = 24214
45678 + 23456 = 69134
23456 + 654321 = 677,777
123456789 + 123456789 = 246913578
1 357 826 828
+ times a + = a plus- times a + = a minus- times a - = a plus+ times a - = a minus
Positive (Plus) times Negative (Minus) always equals a negative (minus).
324536
25,801
plus times plus = plus minus times plus = minus plus times minus = minus minus times minus = plus so when you subtract a number it is the same as adding its negative; for example 7 - 4 = 3 7 + (1)(-4) = 3
1234567 + 123456789 = 124691356
123456789 +987654321 =1111111110