Ch 1- Integers
Qn.1. Fill in the blanks:(1×6)
a. The additive inverse of 37 is _________.
b. (-25) -(-15)=________.
c. 18+ (-45)=________.
d. -7+____= -25
e. The additive Identity for the integer is ____.
f. (-42)×(-5)=________.
2. Find the product, using suitable properties:(1×2)
a. 5402×169-5402×69
b. Evaluate: [(-72)÷12]÷(-3)
3. 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?(2 Mark)
Answers
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ANSWER
A. - 37
B. -10
C. -27
D. (−7)+(−18) = - 25
E. if A is an integer it's additive identity is - A
a + ( - a) = 0
F. 210
2. a.5402 × 169 - 5402 × 69
5402 is common so we should cancel that...
169 × 69 = 11661
b. here we should use BODMAS rules..
[(-72)÷12]÷(-3)
= [ - 6 ] ÷ (-3)
= 2
ANSWER IS 2...
3. Initial Temperature = 40 ° c
Rate of change in temperature = 5 ° c per hour
Time = 10 hours
so , in 10 hours the temperature would be decreased by 10 × 5 = 50 °C.
So , Final Temperature = 40 - 50 = - 10 ° c
HOPE IT HELPS YOU
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