# In the Real World Exercises

### Example 1

Write 1,234,000,000,000 in scientific notation.

### Example 2

Write 5,000,000,000,000,000,000,000,000 in scientific notation.

### Example 3

Write 45 in scientific notation.

### Example 4

Write 0.001 in scientific notation.

### Example 5

Write 0.0000000000989 in scientific notation.

### Example 6

Write 1.5302 × 10^{3} as a regular number.

### Example 7

Write 3.22 × 10<sup>9</sup> as a regular number.

### Example 8

Write 1.1 × 10<sup>0</sup> as a regular number.

### Example 9

Write 3.4 × 10<sup>-2</sup> as a regular number.

### Example 10

Write 2.002 × 10^{-5} as a regular number.

### Example 11

Simplify (3 × 10^{7})(4.2 × 10^{9}). Write answers in scientific notation.

### Example 12

Simplify (1.24 × 10^{4}) + (2.5 × 10^{5}). Write answers in scientific notation.

### Example 13

Simplify (4 × 10^{18}) – (6 × 10^{18}). Write answers in scientific notation.

### Example 14

Simplify (4.2 × 10^{31}) ÷ (2.1 × 10^{19}). Write answers in scientific notation.

### Example 15

Simplify (4.23 × 10^{99}) + (1.1 × 10^{97}). Write answers in scientific notation.