We are given six arithmetic problems to solve: 1. $424 \times 2$

1. Problem Description

We are given six arithmetic problems to solve:

1. $424 \times 2$

2. $7.2 + 0.4$

3. $? = 30,000 - 800$

4. $14 - 6.09$

5. $1,080 \div 12$

6. $599 \times 38$

2. Solution Steps

1. $424 \times 2$

$424 \times 2 = 848$

2. $7.2 + 0.4$

$7.2 + 0.4 = 7.6$

3. $? = 30,000 - 800$

$30,000 - 800 = 29,200$

4. $14 - 6.09$

$14.00 - 6.09 = 7.91$

5. $1,080 \div 12$

$1,080 \div 12 = 90$

6. $599 \times 38$

$599 \times 38 = (600 - 1) \times 38 = 600 \times 38 - 1 \times 38 = 22800 - 38 = 22762$

Alternatively,

$599 \times 38 = 599 \times (30 + 8) = 599 \times 30 + 599 \times 8$

$599 \times 30 = 17970$

$599 \times 8 = 4792$

$17970 + 4792 = 22762$

3. Final Answer

1. $424 \times 2 = 848$

2. $7.2 + 0.4 = 7.6$

3. $29,200 = 30,000 - 800$

4. $14 - 6.09 = 7.91$

5. $1,080 \div 12 = 90$

6. $599 \times 38 = 22762$