MATHS ACTIVITES

ACTIVITY 1The bans of the

Japanese dancers are opened in an angle of 160 degrees. Their ratio is 30 cm. The wood part has a ratio of 170 mm. Calculate the area of the circular region (the material part).

SOLUTION 1Solution: A= π · r² · a = 3,1416 · 30² · 160 = 360 360 1,256.64 cm² A= π · r² · a = 3,1416 · 17² · 160 = 360 360 403.52 cm² 1,256.64 – 403.52 = 853.12 cm²

ACTIVITY 2

A thousand balloons fall down of the ceiling and each one spends five seconds to reach the floor. How much will the balloons spend? (They are all thrown at the same time)

SOLUTION 2

Solution: They will spend five seconds

ACTIVITY 3

A man is descended in a cage into the magma. The counterweight weights ¼ more than the man. If it weights 112,5 kg, How much does the man weight?

SOLUTION 3Solution: ¼ x + x = 112,5 0,25x + x = 112,5 x = 112,5 : 1,25 x = 90

ACTIVITY 4

One of the most famous scenes of the film is the dinner. Find out how many plates of Eyeball Soup (x) and Chilled Monkey Brains (y) are served. To do this you have to solve this system of equations:

x – 4 = -1 4x – 3y = 8

SOLUTION 4x= 11 y= 12

ACTIVITY 5

Imagine that Indiana steals the three gemstones. The value of the five gemstones is 23,479$. How much will he earn?

SOLUTION 5

Solution: 5 gemstones ------ 23,479$ 3 gemstones ------ x X = 23,479 · 3 = 14,087.4$

ACTIVITY 6

This graph shows the number of children scaping per second. Find the equation for this graph.

SOLUTION 6

Solution: y= 5x/2

ACTIVITY 7

A number of 100 archers shoot an arrow per second. An archer spends five seconds to shoot an arrow. During the trajectory 3/5 of the arrows fall into the river. Which is the probability of hurting Indiana in a minute?

SOLUTION 7

Solution: 5s ----- 1 arrow 1min ----- 12 arrows 1min ------- 1200 arrowsIf 3/5 fall into the river there are 2/5 left. 2/5 = 40/100 = 40%

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María Férez

Nerea Riveros