Decimals

Question 1

Multiply by 10^-n

Answer 1

Slides the decimal point n spaces to the left

1.34 * 10^(-3) = 0.00134

Question 2

Divide by 10^-n

Answer 2

Slides the decimal n places to the right

3.55 / 10^(-2) = 355

Question 3

How to divide by a decimal

Answer 3

1. Put the division in fraction form
2. Then “slide” away the decimal points - but always slide an equal number of times top and bottom of the fraction

35/1.4 -> 350(1 slide)/14(1 slide) –>7(50)/7(2) =25

Question 4

Multiplying a positive value by a decimal from 0 to 1

Answer 4

Makes the values smaller

10 * 0.5 = 5

Question 5

Dividing a positive value by a decimal between 0 and 1

Answer 5

Makes the value bigger

10 /0.5 = 20

Question 6

Squaring a decimal between 0 and 1

Answer 6

Makes the decimal smaller (0.5^2 = 0.25)

Question 7

Taking the square root of a decimal between 0 and 1

Answer 7

Makes the value BIGGER

sq. Root of 0.5 = 0.71 (approx)