Presentation on theme: "1. Geometry(38%) Algebra(55%) Trigonometry(7%) 60 Minutes 60 Questions ACT Math NOT 1 Question per minute…the questions get harder as the test goes on."— Presentation transcript:
Geometry(38%) Algebra(55%) Trigonometry(7%) 60 Minutes 60 Questions ACT Math NOT 1 Question per minute…the questions get harder as the test goes on and take more time. 2
Type 1 1) If you are given a value for a variable. 2) Plug the given answer back into the problem and see which answer fits the question. 3) Start plugging with the middle answers first( B/C/G/H) then move to the others. 3 TimeSaver
Solve the equation X^2=625 if X>0. A. 12 B. 15 C. 25 D. 35 E. 50 4 15^2(15x15)=225 25^2(25x25)=625 35^2(35x35)=1225 PLUG the answer back into the variable(x).
MATH PLUG IT IN Type 2 Insert or “SUBSTITUTE” YOUR OWN Value Into the Problem Insert or “SUBSTITUTE” YOUR OWN Value Into the Problem This only works in the following type of problem. (See Example) This only works in the following type of problem. (See Example) TimeSaver
Plug it in Example If x and y are both odd numbers, which of the following MUST be an odd number? A. x + y B. xy C. xy + 1 D. 2xy E. 2x + 2y 3 5 3 5 3+5=8 3+5=8 3*5=15 3*5=153*5+1=16 2(3*5)=30 2(3*5)=30 2(3)+2(5)=16 2(3)+2(5)=16 Plug in a number that fits the definition.
1) POE or Process of Elimination is your best tool on the math section. 2) Eliminate ridiculous and outlying answers to give yourself better odds on each question. 3) This method is very helpful for tougher questions. 7 TimeSaver
8. How many numbers from 1-10 are prime numbers? F.F. 1 F. G.G.2 G. H.H. 4 H. J.J. 5 J. K.K.10 K. 8 5,7 Prime numbers cannot be divided by whole numbers. 1, 2, 3, 4, 5, 6
GOOD SENSE Once you’ve eliminated answers Once you’ve eliminated answers If you get stuck…don’t panic If you get stuck…don’t panic Look at the problem….some give you the answer if you just think about it logically. Look at the problem….some give you the answer if you just think about it logically. If it makes SENSE it could be correct. If it makes SENSE it could be correct.
Math Order of Process If you know how to do the question. Do it. If you know how to do the question. Do it. If you are unsure or think it will be hard: If you are unsure or think it will be hard: POE POE Plug Rule Plug Rule Get beyond the math and think about which answer makes sense… Get beyond the math and think about which answer makes sense…
POWER in your HAND 2 3 4 2 3 41 5 Look at your Hand 1. (Pinky) POE 1. (Pinky) POE 2. (Ring) Plug Rule 2. (Ring) Plug Rule 3. (Middle) Good Sense 3. (Middle) Good Sense 4. (Pointer) 1 min. rule 4. (Pointer) 1 min. rule 5. (Thumb) Stay Positive 5. (Thumb) Stay Positive
ON THE TEST In our experiences these are the most crucial types of problems found on the test with solutions. Not all types of problems are covered.
*Angles inside any triangle add up to 180 degrees Area of a Triangle ½(Base*Height) Pythagorean Theorem A^2 + B^2 = C^2 B H 13 A C B Hypotenuse is always C (long side). -Two sides are identical making the two adjacent angles equal If A=A then x=x A A XX Isosceles Triangle
30-60-90 Rule 1-2- √3 45-45-90 Rule 1-1-√2 14 60 30 45 1 √3 2 √2 1 1 Know all the dimensions of these two triangles. If you memorize these two rules you will save valuable time on the test. TimeSaver
In the figure below AB≠AC and BC is 10 units long. What is the area, in square inches, of ABC ? F.F. 12.5 F. G.G. 25 G. H.H. 35 H. J.J. 50 J. K.K. Cannot be determined K. from the given information from the given information 15 In order to find the area you must have a way to find ½ Base x Height. In this case there is no way to find the height of line AD. A=1/2BH H….? B=10 12345
The triangle below is isosceles and is drawn to scale. What is the measure of angle N ? A.A. 22° A. B.B. 68° B. C.C. 78° C. D.D. 79° D. E.E. 89° E. 16 22 N In an isosceles triangle 2 sides are equal in length and the two angles will be equal also. So since all angles of a triangle = 180, 2N-22=180 or N=79 12345
Complementary Angles - When any line intersects a right angle A+B=90 ° A+B=90 ° Y - RULE - When any line intersects a straight line A+B=180 ° A 17 B AB
X - Rule - two intersecting straight lines A+C(or D)=180 B+C(or D)=180 A=B, C=D Z – Rule - 2 parallel lines intersected by a straight line -B, C, F, G are equal -A, D, E, H are equal -A/C, D/B, E/F, G/H are -A/C, D/B, E/F, G/H are complimentary and add to 180 18 A B CD BA D C H G F E
In the figure below, X is on line AY, Angle XYZ measures 45°, and AXZ measures 130°. What is the measure of Angle XZY ? F.F. 45° F. G.G. 60° G. H.H. 85° H. J.J. 95° J. K.K. 105° K. 19 Because angle AXZ and angle YXZ are complimentary angles they add to 180 Find XZY by subtracting YXZ(50) and XYZ(45) from 180 50 12345
Equation of a line y=mx+b m=slope( rise/run ) b=y intercept Finding a line intercept Solve to find both x & y (X,Y) x + y =10 and y = 4 x + y =10 and y = 4 x=6 y=4 (6,4) Y X rise run B= 20
When graphed in the (x,y) coordinate plane, at what point do the lines x + y = 5 and y = 7 intersect? A.A. (–2,0) A. B.B. (–2,7) B. C.C. (0,7) C. D.D. (2,5) D. E.E. (5,7) E. 21 Don’t be fooled by this type of question solve for X, they’ve given you the value of Y. (X,Y) x+(7)=5 X=-2, Y=7 (-2,7) 12345
Circumference and Area Diameter=2(R) Area= r ^2 Circumference=2 r or D LEARN MORE ABOUT CIRCLES ON THE MATH HELP DVD Radius(r) Diameter(d) 22
A Chord is 24 inches long from the center of a circle, as shown below. What is the radius of the circle to the nearest tenth of an inch? A. 29.0 B. 24.5 C. 16.9 D. 13.0 E. 10.9 23 12345 Radius= Hypotnuse 5^2 + 12^2 = C^2 25+144=169 169=C^2 13^2=C^2 C=13 r 5 24
Know the function of a variable(x) *Its simply a number you don’t know Know how to solve for (x) *Get X on a side by itself Know how to use FOIL *When given a problem in this format (x+M)(x+N) Simplify using the FOIL method F-First I-Inner O-Outer L-Last F-First I-Inner O-Outer L-Last x*x M*x x*N M*N x*x M*x x*N M*N Simplify the remaining variables for your answer 24
If x + 2y = 1, and 2x + y = 5, then x + y = ? F.F. 1 F. G.G. 2 G. H.H. 3 H. J.J. 4 J. K.K. 5 K. What is the average of 3/8 and 0.065 ? A.A. 0.05125 A. B.B. 0.1825 B. C.C. 0.22 C. D.D. 0.375 D. E.E. 0.5125 E. 25 2(1-2y)+y=5 or 2-3y=5 -3y=-3 so y=1 X+2(1)=1 so X=-1 0.375 +0.065 0.440/2= 0.22 12345 Solve for x in the first equation and then plug it in and solve for y in the second equation. The answers are in decimal form so change 3/8 to 0.375 and add it to 0.065 then divide by 2
Exponents 10^5( add 4 0’s to right ) becomes 100,000 10^-5( add 4 0’s to the left or 1/10^5 ) becomes 0.00001 Square Roots (round non perfect SR’s to closest SR) Square Roots (round non perfect SR’s to closest SR) √65 = est. 8 √145= est. 12 MORE ON EXPONENTS SEE THE MATH HELP DVD Radicals 26 TimeSaver
3 x 10 – 4 = ? F.F. –30,000 F. G.G. –120 G. H.H. 0.00003 H. J.J. 0.0003 J. K.K. 0.12 K. 27 0.0 0 0 30 Negative exponents= add one minus exponent number of zeros to the left of the number preceded by a decimal 12345
What integer most nearly approximates (√50)(√80)? A.A. 20 A. B.B. 40 B. C.C. 63 C. D.D. 200 D. E.E. 2,000 E. 28 Estimate - knowing that √49 = 7 & √81 = 9. Thus (7)(9)=63 12345
Know the following terms: Sin x- Cos x- Csc x- Sec x- Tan x- Cot x- Opposite Hypotenuse Adjacent Hypotenuse Opposite Hypotenuse Adjacent Opposite Adjacent Opposite X Adjacent hypotenuse 29
“Trick”onometry SOH-CAH-TOA or “SOCK-A-TOWA” SOH-CAH-TOA or “SOCK-A-TOWA” SOH is Sin=Opp/Hyp SOH is Sin=Opp/Hyp COH is Cos=Adj/Hyp COH is Cos=Adj/Hyp TOA is Tan=Opp/Adj TOA is Tan=Opp/Adj TimeSaver
In right triangle ABC below, what is the sine of A ? A.A. 7/24 A. B.B. 7/25 B. C.C. 24/7 C. D.D. 24/25 D. E.E. 25/24 E. 31 Sin x=opposite/hypotenuse Find Hypotenuse A^2+B^2=C^2 7^2+24^2=x^2 or 625=x^2 or x=25 Sin x=24/25 X 12345
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