Multiplication and Division of Signed Mumbers: Multiplication of a negative number by a positive number

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+1\times-1=-1$

Let's recall the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$-10\times+2=-20$

Let's recall the law:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+30\times-2=-60$

Let's recall the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+10\times-1=-10$

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$-8\times+3=-24$

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+3\times-4=-12$

Let's recall the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+2\times-7=-14$

Let's recall the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$-6\times+2=-12$

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$-1\times+4=-4$

Let's recall the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+2\times-4=-8$

Due to the fact that we are multiplying a positive number by a negative number, the result must be a negative number:

$+\times-=-$

Therefore:

$+9\times-4=-36$