Welcome to your 07 Math

1. 
Find the value of 625 × (–35) + (– 625) × 65
2. 
Circumference of a circle of diameter 5 cm is
3. 
Every natural number is a rational number but every rational number need not be a natural number.
4. 
(– 16) ÷ 4 is not same as
5. 
After 10 years Arpit will be three times as old as he was four years ago. What is his present age?
6. 
Which of the following statements is not true?
7. 
– 35 × 107 is not same as
8. 
(-9) × 17 is not equal to:
9. 
The quantities x and y are positive. If x is decreased by 10 percent and y is increased by 10 percent, then the product of x and y is:
10. 
4x + 5 = – 7 has_______ solution
11. 
A car manufacturer claimed that CO₂ emissions from a car were 160g/km. Their latest model has emissions at 15% less. What are the CO₂ emissions on the new car?
12. 
What is 60 cm as a percentage of 4 m?
13. 
4 squares each of the side 10 cm have been cut from each corner of a square sheet of paper of size 100 cm x 100 cm. From the remaining piece of paper, an isosceles right triangle is removed whose equal sides are each of 10 cm length. Find the area of the remaining part of the paper.
14. 
If 1m² = x mm² , then the value of x is
15. 
In the standard form of a rational number, the common factor of numerator and denominator is always:
16. 
One day the temperature in London is 18ºC and in Athens it is 80% higher. What is the temperature in Athens?
17. 
Two rational numbers are said to be equivalent or equal, if they have the same ______ form
18. 
Is x=7 a solution of equation 2x-7=9 ?
19. 
The ratio 3 : 8 is equal to
20. 
The sum which will earn a simple interest of ₹126 in 2 years at 14% per annum is