Arithmetic and Fractions

Question 1

1/2

Answer 1

.5

Question 2

1/4

Answer 2

.25

Question 3

1/3

Answer 3

.3333

Question 4

2/3

Answer 4

.6666

Question 5

1/5

Answer 5

.2

Question 6

1/6

Answer 6

.1666

Question 7

5/6

Answer 7

.8333

Question 8

1/7

Answer 8

.143

Question 9

1/8

Answer 9

.125

Question 10

3/8

Answer 10

.375

Question 11

1/9

Answer 11

.1111

Question 12

1/10

Answer 12

.1

Question 13

1/20

Answer 13

.05

Question 14

Trick for fraction/decimal conversion

Answer 14

1) multiply numerator and denominator by same number, so that denominator = 100
2) If fraction with denominator is multiple of 10 - write as product of two fractions

i.e. 1/20 = (1/2) (1/10) = (.5)(10^-1)=.05

Question 15

How to compare fractions

Answer 15

1) Set up proportion and use cross multiplication
2) Use number sense (recognize when ugly fraction close to friendly fraction)
3) Convert fractions so that denominator is 100 (or close to 100)

Question 16

Proportion cancellation rules

Answer 16

Can only cancel vertically or horizontally

Question 17

What does it mean when the numerator is bigger than the denomenator?

Answer 17

The fraction is greater than 1

Question 18

What does it mean when the denominator is bigger than the numerator?

Answer 18

The fraction is less than 1

Question 19

Multiplying decimal by 10

Answer 19

Move decimal one to the right

Question 20

Dividing decimal by 10 or multiplying by .1

Answer 20

Move decimal one to the left

Question 21

Multiplying by positive power of 10

Answer 21

Move decimal right equal number of spaces to the power

Question 22

Divide by positive power of 10 or multiply by negative power of 10

Answer 22

Move decimal left equal number of spaces to the power

Question 23

Divide by negative power of 10

Answer 23

Same as multiplying by positive power of 10