Fractions and Decimals Flashcards
1/2
0.5
50%
1/3
0.333
33 1/3%
2/3
0.666
66 2/3%
1/4
0.25
25%
3/4
0.75
75%
1/5
0.2
20%
2/5
0.4
40%
3/5
0.6
60%
4/5
0.8
80%
1/6
0.166
16 2/3%
1/8
- 125
12. 5%
3/8
- 375
37. 5%
5/8
- 625
62. 5%
5/6
83.33% = 0.83
7/8
87.5% = 0.875
numerator
number on top, the part
denominator
number on bottom, the whole
Converting from Improper to Proper
Divide the numerator by the denominator with the remainder over the divisor aka denominator.
Eg. 16/3 = 5 1/3
Converting from Proper to Improper
Multiply the divisor by the integer, then add the remainder.
Eg. 4 2/7 = (4x7) + 2 = 28+2 = 30
7 7 7
Adding and Subtracting Fractions
Multiply the denominators together to form the new denominator. Then cross multiple the Ds and Ns and add these two numbers together always multiplying UP from D to N.
Eg. 3 + 4 = 21 + 20 = 41
5 7 5x7 35
Subtraction works the same way (except you subtract rather than add the two sums)
Multiplying Fractions
Just multiply exactly as they are.
Dividing Fractions
Flip the second fraction and multiply.
Eg. 2 / 3 = 2 x 8 = 16
5 8 5 3 15
Reciprical
the result when the N and D of the fraction are flipped. The product of any number an dits reciprocal is 1.
Eg. 5 and 7
7 5
Reducing Fractions
Just remember: you can do anything to a fraction as long as you do exactly the same thing to both the numerator and the denominator.