Integer operations, step by step
Integers add negative numbers to the mix, and the sign rules are the whole challenge.
The question
(-7) + 19
- Put a counter on -7. Everything else is which way it slides and how far.
- Adding a positive moves right, the way it always has.
- So slide 19 to the right, from -7 to 12. (-7) + 19 = 12.
How it works.
- 01
Put a counter on -7. Everything else is which way it slides and how far.
- 02
Adding a positive moves right, the way it always has.
- 03
So slide 19 to the right, from -7 to 12. (-7) + 19 = 12.