Small Near Doubles: 1+2 Through 4+5

Let's master the small near doubles. 1+2: double 1 is 2, plus 1 is 3. 2+3: double 2 is 4, plus 1 is 5. 3+4: double 3 is 6, plus 1 is 7. 4+5: double 4 is 8, plus 1 is 9. Each time, you double the smaller number and add 1.