S K Gupta and Anubhuti Gangal Solutions for Exercise 2: EXERCISE 1(B)

Use the number line to work out $-4\times 3$.

Use the number line to work out $5\times -2$.

Of the two integers, if one is negative, then their product must be negative.

The product of $a$ negative and $a$ positive integer may be zero.

If $a>1$, then there is no integer $b$ such that $a\times b=b\times a=b$.

Which of the following expression are equal to $-20?$

$$\begin{gathered} \left(I \right)-4\times 5 \\ \left(II\right) -32+10-\left(-2\right) \\ \left(III\right) -6\times 2-\left[-2\times -4\right] \\ \left(IV\right) 5\times \left(-2\right)+\left(-3\right)\times 4 \end{gathered}$$

A certain freezing process requires that room temperature be lowered from $40°C$ at the rate of $5 °C$ every hour. What will be the room temperature $10$ hours after the process begins$?$

Use $<$ or $>$ to compare $-2\times (-1)\times 4\times 2\times (-3)$ and $(-2)+(-1)+4+2-(-3)$.