We need to solve five arithmetic problems: 1. $15.98 + 26.314 = ?$

1. Problem Description

We need to solve five arithmetic problems:

1. $15.98 + 26.314 = ?$

2. $125.48 - 72.3 = ?$

3. $122,456 - 11,999 = ?$

4. $3^2 + 10 = ?$

5. $0.9 \div 10 = ?$

6. $4 - 1.15 = ?$

2. Solution Steps

Problem 1: $15.98 + 26.314$

Align the decimal points and add:

$15.980$

$+ 26.314$

$= 42.294$

Problem 2: $125.48 - 72.3$

Align the decimal points and subtract:

$125.48$

$- 72.30$

$= 53.18$

Problem 3: $122,456 - 11,999$

Perform the subtraction:

$122456$

$- 11999$

$= 110457$

Problem 4: $3^2 + 10$

First calculate $3^2 = 3 \times 3 = 9$

Then add 10: $9 + 10 = 19$

Problem 5: $0.9 \div 10$

Dividing by 10 moves the decimal point one place to the left:

$0.9 \div 10 = 0.09$

Problem 6: $4 - 1.15$

$4.00 - 1.15 = 2.85$

3. Final Answer

1. $15.98 + 26.314 = 42.294$

2. $125.48 - 72.3 = 53.18$

3. $122,456 - 11,999 = 110,457$

4. $3^2 + 10 = 19$

5. $0.9 \div 10 = 0.09$

6. $4 - 1.15 = 2.85$