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Q II Solve the following:

a) Use the short cut method to find the sum

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8+ 9+ 10 + 11 + 12

Answer:

1 + 12 = 13

2 + 11= 13

3 + 10 = 13

4 + 9 = 13

5 + 8 = 13

6 + 7 = 13

You stop at 6  because then after wards you are repeating the number eg. 7 + 6, 8 + 5 etc

Now we have 13 repeating 6 times so we get

13 x 6 = 78

 

b) Arrange in ascending order

1.05 , 3.05, 0.05 , 2.05

Answer: 0.05, 1.05, 2.05, 3.05

c) Arrange the following in descending form

9.054, 9.045, 9.450, 9.540

Answer: 9.540, 9.450, 9.054, 9.045

d) Write the following as decimal:

2 1/4 = (2 x 4 ) + 1 / 4 = 9/4 = (9 x 25) / (4 x 25) = 225/100 = 2.25

e) Write the following as fraction:

86.245 = 86245/1000

Mixed Fraction = 86 245/1000