The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time it would be 12° below zero?

20 + (-9) + (9)

11 x (–1) = _____

The set of integers is not closed under

(-10)\(\times \) __ = 20

_____\(\times \) (-9) = -45

(-5) + ____ = -100

171+____=0

The additive inverse of (–32) is (–32)

15 - (-18) is the same as 15 + 18

8 x (−4) = 32

The product of two negative integers is a positive integer

(−125) + 25 = −100

Add the following
(i) 8 and –12 using number line
(ii) (–3) and (–5) using number line
(iii) (-100 + (-10)  
(iv) 20 + (-72)
(v) 82 + (-75) 
(vi) -48 + (-15)
(vii) -225 + (-63)

Kabilan was having 10 pencils with him. He gave 2 pencils to Senthil and 3 to Karthik. Next day his father gave him 6 more pencils, from that he gave 8 to his sister. How many pencils are left with him?

When Kala woke up, her body temperature was 102°F. She took medicine for fever. After 2 hours it was 2°F lower. What was her temperature then?

Check the following for equality and if they are equal, mention the property.
(i) (8 - 13) x 7 and 9-(13 x 7)
(ii) [(-6) - (+8)] x (−4) and (-6)- [8(−4)]
(iii)3 x [(-4) + (-10)] and [3 x (-4) + 3 x (-10)]

Given 168 x 32 = 5376 then, find (−5376) ÷ (-32). 

(-400) divided into 10 equal parts gives _____.

Add:
(i) (–70) and (–12)
(ii) 103 and 39.

From the ground floor a man went up six floors and came down six floors. In which floor is he now?

Find the value of :
(i) (-35)\(\times \) (-11) 
(ii) 96\(\times \)(-20) 
(iii) (-5)\(\times \)12 
(iv) 15\(\times \) 5 
(v) 999\(\times \)0

Are (–42) x (–7) and (–7) x (–42) equal? Mention the property.

Each day, the workers drill down 22 feet further until they hit a pool of water. If the water is at 110 feet, on which day will they hit the pool of water?

Subtract the following using the number line.
(i) –3 – (–2) 
(ii) +6 – (–5)

A shopkeeper earns a profit of Rs. 5 by selling one notebook and incurs a loss of Rs. 2 per pen while selling of his old stock. In a particular day he earns neither profit nor loss. If he sold 20 notebooks, how many pens did he sell?