2nd Week of EOG Review Book

Divisibility Rules:

The rules for the following numbers:2: when a number is even (20, 12, 16……)3: Add the numbers up and if it is a multiple of

three then it is divisible by three…(ex.. 36 = 3 + 6 = 9 which is a multiple of three)

4: The last two numbers are a multiple of four…. (ex…228)

5: The number has to end in a five or zero …(ex…15, 20, 30……)

6: If the number is divisible by two and three then it is divisible by six.

9: the sum of the digits is a multiple of nine…..(ex…..33 = 3 + 3 = 9 which is a multiple of nine)

10: The number ends in zero….(ex….10, 200, 340…..)

What are these numbers divisible by putting an “X” in each box that it is

divisible by:

2 3 4 5 6 9 10

8

10

220

15

270

11

Converting Fractions to Decimals

• To convert a fraction to a decimal, divide the numerator by the denominator and add a decimal and two zero in the dividend. Keep adding zeros until it terminates or repeats.

• You can also convert to decimals by getting the denominator to equal to 100. What ever you did to the denominator you do to the numerator.

• 1. ¾ 2. 2/3 3. 3/5 4. 2/7

Converting Fractions to Decimals

1. 4/52. 3/53. 7/94. 3/165. 2/36. 5/87. ½8. 5/12

Converting Mixed numbers to decimals

• If there is a whole number with a fraction, write the whole number to the left of the decimal point. Then change the fraction to a decimal.

• Change the fraction by dividing the denominator into the numerator and adding a decimal and two zero or by setting the bottom denominator to a 10, 100, or 1,000.

• Example) • 1. 4 1/10 2. 16 2/3 3. 12 7/8

Changing Decimals to Fractions

1. 8 5/112. 15 3/53. 13 2/34. 30 1/35. 3 ½6. 1 7/87. 7 1/4

Changing Decimals to Fractions

• Step1: Copy the decimal without the point. This will be the top number of the fraction

• Step 2: The bottom number is a 1 with as many 0’s after it as there are digits in the top number.

• Step 3: You then need to reduce the fraction

1. 0.2 2. 0.65 3. 0.125

Changing Decimals to Fractions

1. 0.552. 0.63. 0.124. 0.755. 0.826. 0.037. 0.96