Adding and Subtracting Positive and Negative Numbers
How:
positive + positive = add and the same sign
negative + negative = add and the same sign
negative + positive = subtract and take the sign of the bigger number
Ex:
1. 3+7= 10 the same signs, we add
2. -3-7= -10 the same signs, we add
3. -3+7= 4 different signs, we subtract and take the sign of the bigger number
4. -10+2= -8 different signs, we subtract and take the sign of the bigger number
try out these problems by yourself
1. -20-11= ?
2. 105-200= ?
3. 3-(-4)= ?
4. -3/4 + 1/4 = ?
5. -5-(-9)= ?
6. 5/12- (-10/12) = ?
positive + positive = add and the same sign
negative + negative = add and the same sign
negative + positive = subtract and take the sign of the bigger number
Ex:
1. 3+7= 10 the same signs, we add
2. -3-7= -10 the same signs, we add
3. -3+7= 4 different signs, we subtract and take the sign of the bigger number
4. -10+2= -8 different signs, we subtract and take the sign of the bigger number
try out these problems by yourself
1. -20-11= ?
2. 105-200= ?
3. 3-(-4)= ?
4. -3/4 + 1/4 = ?
5. -5-(-9)= ?
6. 5/12- (-10/12) = ?