1) A chameleon was sitting on a yellow flower.
Suddenly, 40% of its skin turned blue, and the remaining part was still yellow.
If the blue part of its skin now covers 20 square centimeters, what was the total area of the chameleon’s skin?

2) The population of a town increased by 12% to become 8960.
What was the original population?

3) A special type of elastic string shrinks by 0.15 of its original length when stretched to its maximum.
If the original length of the string is 3.2 meters, what will be its length when stretched to its maximum?

4) A water tank was 80% full.After using 25% of the water, what percentage of the tank is now full?

5) Ritu scored 45 out of 60 in a test. What is her percentage?

6) The figure below is made of small triangular units.
5 triangular units are currently unshaded.
How many more triangular units must be unshaded so that 2/3 of the figure is unshaded?

7) The algebraic expression for the statement “Half of a number ‘z’ subtracted from 20 gives 15” is:

8) A special dice has faces marked with colors:
Red, Blue, Green, Yellow, and Orange.
When rolled 50 times, Red came up 20% of the time.
How many times did Red not come up?

9) Which of the following is closest to 1?

10) If n = 0.9.
Find the value of: (1 – n)(1 + n)(1 + n² )

11) What is 3.25 + 2.7?

12) Convert 80% into a fraction in lowest terms.

13) What is 3/5 as a percentage

14) What is 2/5 of 3/4?

15) A water tank is 3/4 full.
A leak at the bottom empties 1/3 of the water in 1 hour.
If no more water is added, what fraction of the full capacity of the tank will remain after 2 hours?

16) Estimate the value of 3.82 × 1.9 by rounding to 1 decimal place.

17) Simplify:

18) Divide
7.2 ÷ 0.6

19) Which of the following is equal to √0.04 ?

20) A cookie factory uses 0.35 kg of flour to make one batch of 10 cookies.
How much flour (in kg) is needed to make 100 cookies?
If the factory has 8.75 kg of flour, how many batches of cookies can they make?