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Find each of the following products:
(a) $${3}\times{\left(-{1}\right)}$$
(b) $${\left(-{1}\right)}\times{225}$$
(c) $${\left(-{21}\right)}\times{\left(-{30}\right)}$$
(d) $${\left(-{316}\right)}\times{\left(-{1}\right)}$$  Speed
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01:25 ## QuestionMathsClass 7

Find each of the following products:
(a) $${3}\times{\left(-{1}\right)}$$
(b) $${\left(-{1}\right)}\times{225}$$
(c) $${\left(-{21}\right)}\times{\left(-{30}\right)}$$
(d) $${\left(-{316}\right)}\times{\left(-{1}\right)}$$

(a) $$-3$$
(b) $$-225$$
(c) $$630$$
(d) $$316$$
4.6     4.6     ## Solution

Here, we will use the below rules,
$${\left(+\right)}\times{\left(-\right)}={\left(-\right)}$$
$${\left(-\right)}\times{\left(+\right)}={\left(-\right)}$$
$${\left(-\right)}\times{\left(-\right)}={\left(+\right)}$$
$${\left(+\right)}\times{\left(+\right)}={\left(+\right)}$$
(a)$${3}\times{\left(-{1}\right)}=-{3}$$
(b)$${\left(-{1}\right)}\times{225}=-{225}$$
(c)$${\left(-{21}\right)}\times{\left(-{30}\right)}={630}$$
(d)$${\left(-{316}\right)}\times{\left(-{1}\right)}={316}$$          