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EIGHT GRADE MATH-A

MATH REVIEW AND TEST PREP PART A

QuestionAnswer
MULTIPLYING MIXED NUMBERS: 3 1/2 X 2 1/3 FIRST CHANGE THEM TO IMPROPER FRACTIONS . THEN MULTIPLY THEM. AS SHOWN HERE ----- 7/2 X 7/3 = 49/3 = 16 1/3
DIVIDING FRACTIONS- ---- 1/2 / 1/3 MULTIPLY THE FRACTIONS , USING THE RECIPROCAL OF THE SECOND FRACTION--------------------AS SHOWN HERE: 1/2 / 1/3 = 1/2 X 3/1 = 3/2
TO CHANGE A DECIMAL TO A FRACTION-------- a. 0.21 1. DRAW A LINE BENEATH THE DECIMAL 2. FOR THE DENOMINATOR- THE DECIMAL POINT BECOMES A "1" ANY THING ELSE BECOMES A ZERO.... 0.21 BECOMES 21/100
CHANGING A FRACTION TO A PERCENTAGE.------ a. 1 / 2 jUST MULTIPLY BY 100 AS SHOWN HERE: 1/2 X 100/1 = 100/2 = 50%
CHANGING A FRACTION TO A DECIMAL.------- a. 1/2 1. FIRST MULTIPLY BY 100 TO GET A PERCENTAGE: 1/2 X 100 = 50 % -------- 2. THEN DIVIDE YOUR ANSWER BY 100 TO GET A DECIMAL. 50/100 = 0.50
CHANGING DECIMAL TO PERCENT-------- a. 0.20 JUST MULTIPLY THE DECIMAL BY 100 EXAMPLE---. 0.20 X 100 = 20%
ROUNDING: TO THE NEAREST WHOLE NUMBER: a. 12.333 ANSWER = 12
ROUND TO THE NEAREST TENTH: a. 1.284 b. 32.34 ANSWERS: a. 1.2 b. 32.3
ROUND TO THE NEAREST 100TH: a. 1.305 b. 45.666 ANSWERS a. 1.31 b. 45.67
ROUND TO THE NEAREST 1000TH: a. 1.3054 b. 45.6665 ANSWERS a. 1.305 b. 45.667
MULTIPLYING POSITIVE AND NEGATIVE SIGNS; #1. (-2) (2) (-2) #2. (2) (-3) (-1) (-1) RULE: JUST COUNT THE NUMBER OF NEGATIVE SIGNS IN YOUR PROBLEM. IF YOU HAVE AN ODD NUMBER OF NEGATIVES (1, 3, 5, 7.......) THEN YOU ANSWER IS NEGATIVE. OTHERWISE YOUR ANSWER IS POSITIVE ANSWERS: #1. 8 (TWO NEGATIVES--NOT ODD #) #2. -6
DIVIDING NEGATIVE INTERGERS (NUMBERS): a. -2 / 2 b. -2/-2 ANSWERS: a. -1 ( ONE NEGATIVE SIGN-ODD NUMBER OF NEGATIVE SIGNS) b. 1 (NOT ODD NUMBER OF NEGATIVE SIGNS)
CHANGE THE FOLLOWING NUMBERS TO A SCIENTIFIC NOTATION. #1. 2345.45 #2. 100009.23 #3. 0.000023 #4. 0. 00234 ANSWERS- #1. 2. 34545 EE 3 #2. 1. 000923 EE 4 # 3. 2.3 EE -5 #4. 2.34 EE -3
CHANGE THE FOLLOWING MIXED NUMBERS INTO IMPROPER FRACTIONS- #1. 3 1/2 #2. 4 1/3 #3. 7 2/4 ANSWERS: #1. 7/2 #2. 13/3 #3. 30/4
CHANGE THE FOLLOWING IMPROPER FRACTIONS INTO MIXED NUMBERS: #1. 4/3 #2. 8/5 #3. 9/2 ANSWERS: #1. 1 1/3 #2. 1 3/5 #3. 4 1/2
CHANGE THE FOLLOWING SCIENTIFIC NOTATIONS INTO NATURAL NUMBERS a. 1.3 EE -3 b. 1.543 EE -5 c. 2. 45 EE 3 d. 3.9 EE 4 ANSWERS: a. 0.0013 b. 0.0000154 c. 2550 d. 39000
PLEASE REDUCE THE FOLLOWING FRACTIONS TO THEIR LOWEST TERMS: a. 20/60 b. 33/66 c. 12/ 18 ANSWERS: a. 1/3 b. 1/2 c. 2/3
FIND THE LCD ( LOWEST COMMON DENOMINATOR- ALSO CALLED LCM) GIVEN THE FOLLOWING FRACTIONS: 1/2 , 3/5, 2/4, 4/6 , 2/3 ANSWER: LCD (ALSO CALLED LCM)= 60
Created by: eccharles77