Arithmetic

Question 1

What is the value of 2005 plus 2005 thousandths, written as a decimal?

Answer 1

• 2005 thousandths = 1/1000 x 2005
  -1000/2005 = 2.005
  2005 + 2007.005

Question 2

When written in decimal form 1/81 = 0.012345679.

What is the value of 2/81 or six decimal places?

Answer 2

2/81 = 1/81 x 2

The Work out

Question 3

What is the value of 1^6 - 2^5 + 3^4 - 4^3 + 5^2 - 6^1

Answer 3

Same as; (1^6+3^4+5^2) - (2^5+6^1+4^3)

Question 4

61^2-39^2 / 51^2-49^2

Answer 4

Difference of 2 squares

61-39)(61-39) / (51-49)(51-49