Addition of Integers using the number line 1. Use the number line to find the sum of 3 and 7. ( 3 & 7 are both positive) TOT 2 2 3 4 5 6 7 8 9 On the number line start with point 3 and count 7 units to the right. the number line does it stops? It is at point 10, hence, 3 + 7 = 10. the sum of 2 and.5.-28.5 are both negative 10 At what point on )​