| $$a$$ | 0 | 0,5 | $$\frac{3}{4}$$ | 1 | $$1\frac{1}{6}$$ | 1,5 |
| $$2a$$ | $$2 \cdot 0 = 0$$ | $$2 \cdot 0.5 = 1$$ | $$2 \cdot \frac{3}{4} = \frac{3}{2} = 1.5$$ | $$2 \cdot 1 = 2$$ | $$2 \cdot 1\frac{1}{6} = 2 \cdot \frac{7}{6} = \frac{7}{3} = 2\frac{1}{3}$$ | $$2 \cdot 1.5 = 3$$ |
| $$2a + 3$$ | $$0 + 3 = 3$$ | $$1 + 3 = 4$$ | $$1.5 + 3 = 4.5$$ | $$2 + 3 = 5$$ | $$2\frac{1}{3} + 3 = 5\frac{1}{3}$$ | $$3 + 3 = 6$$ |
| $$3(2a + 3)$$ | $$3 \cdot 3 = 9$$ | $$3 \cdot 4 = 12$$ | $$3 \cdot 4.5 = 13.5$$ | $$3 \cdot 5 = 15$$ | $$3 \cdot 5\frac{1}{3} = 3 \cdot \frac{16}{3} = 16$$ | $$3 \cdot 6 = 18$$ |