Answers and Explanation:
Addition of Integers
Get the sum of two integers with like signs, add the absolute values of the two numbers and use the common sign.
Example:
a.) 2 + 4 = 6 b.) (-4) + (-6) = -10
Get the sum of two integers with different signs; get the absolute values of the two signs then subtract the smaller value from the larger value and use the sign of the number having the greater value.
Example:
a.) -13 + 6 = ? 13 - 6 = 7, since -13 has a greater value than 6 we use the negative(-) sign for the answer.
b.) 15 + (-5) = 10
Answers:
II.
6.) 19 8.) -12
7.) -13 9.) 50
SUBTRACTION of Integers
Get the difference of two integers, change the sign of the subtrahend and proceed to addition.
Ex.
a.)-5-8= ? -5 + (-8) = -13
b.) -13-(-9)= ? -13+ 9 = -4
Answers:
III.
10.)-13 12.)-212
11.)-4 13.)33
Multiplication of Integers
The Answer or Product is POSITIVE, if the two factors have the same sign.
The Product is NEGATIVE, if the two factors have different signs.
Ex.
a.)6 x 7 = 42
b.) 17 x -12 = -204
Answers:
14.)42 16.)-75
15.)-204 17.)-198
Division of Integers
The QUOTIENT or ANSWER is POSITIVE, if the two integers with the same sign.
The QUOTIENT is NEGATIVE, if the two integers have different signs.
Ex.
a.)-56 ÷ -8 = 7
b.) -120 ÷ 8 = -15
Answers:
18.) -56 ÷ (-8) = 7
19.) -120 ÷ 8 = -15
20.) 100÷10 = 10
