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### Grade 5 - Mathematics1.7 Working with Negative Numbers

 Addition Answer Example Sum of two positive integers is always a positive number 4 + 5 = 9 Sum of a positive and negative integer is eitherpositive or anegative number 3 + -4 = -1 8 + -2 = 8 - 2 = 6 Sum of a negative and positive is either positive number or a negative number -3 + 4 = 1 -6 + 2 = -4 Sum of a two negative integers is always a negative number -3 + -4 = -7 -6 + -2 = -6 - 2 = -8 Subtraction Answer Example Difference of two positive integers is either positive or a negative number 7 - 5 = 2 5 - 7 = -2 Difference of a positive and negative integer is always positive number 3 - -4 = 3 + 4 = 7 6 - -2 = 8 Difference of a negative and positive integer is always negative number -3 - +4 = -3 - 4 = -7 -8 - +2 = -8 - 2 = -10 Difference of a two negative integers is either positive or a negative number -3 - -4 = -3 + 4 = 1 -6 - -2 = -6 + 2 = -4
Method:
1. When there are two numbers, one positive and the other negative, subtract and use the sign of the greater number.
2. When two numbers are of the same sign, add and use the sign the numbers have,
3. When there is a negative sign, before a negative number, it becomes a positive number.
4. When there is a positive sign, before a negative number, it remains unchanged.

Example: -4-5
Since the signs are same, add and use the negative sign.

Example: 4 -(-3)
When there is a negative sign before the negative number, it becomes a positive number
4+3

Example: 7 +(-3)
When there is a positive sign before the negative number, it remains unchanged
7-3

Negative numbers are used in many ways, including financial statements, altitude measurements, temperature, golf scores and atomic changes.

Directions: Solve the following. Also write 5 examples of each kind.
 Q 1: 4 - (-0) =4040400 Q 2: 0 + (-15) =0Cannot be solved-1515 Q 3: 10 - (-11) =20-11121 Q 4: 5 + (-2) =2753 Q 5: (-2) - (-64) =-62-666266 Q 6: 4 - (-7) =1211710 Q 7: 18 + (-18) =-1836180 Q 8: 48 - 22 =26247022 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!