In the first formula, 5 can be divided into 1+4, so that 9 and 1 can be added to get 10, and then 10 and 4 can be added to get the answer 14.
In the second formula, you can divide 8 by 4+4, so you can add 6 and 4 to get 10, and then add 10 and 4 to get the answer 14.
This arithmetic method is to round the integer up first, and then perform simple arithmetic operations.
This method of splitting and rounding is very common in elementary school arithmetic.
Add operation
1, add two numbers with the same sign, take the same sign as the addend, and add the absolute values.
2. Add two numbers with different signs. If the absolute values are equal, the sum of two numbers with opposite numbers is 0; If the absolute values are not equal, take the sign of the addend with the larger absolute value and subtract the smaller absolute value from the larger absolute value.
3. Add two numbers with opposite numbers to get 0.
4. Adding a number to 0 still gets this number.
You can add two opposite numbers first.
6. Numbers with the same sign can be added first.
7. Numbers with the same denominator can be added first.