Maths-hard topics 3.0 / 5 based on 1 rating ? MathematicsPercentagesGCSECCEA Created by: Grace TimoneyCreated on: 21-05-16 20:44 55% of 360 = 50% + 5% 360/2=180 5%=180/2=18 180+18=198 Percentage Trick - Solve precentages mentally - percentages made easy with the cool math trick! 1 of 16 56% of 440= 50% + 1%*6= 50%= 440/2=220 1%=4.4 6%=4.4*6=26.4 56%=220+26.4=246.4 Percentage Math Trick 2 - Solve percentages mentally - percen 2 of 16 Calculating the length of a line from coordinates L=/(x2-x)2+(y2-y)2 3 of 16 Calculating the midpoint of a line ( x1+x2/2 ' y1+y2/2 ) 4 of 16 Formula for finding the gradient of a line joining two points m= y2-y1/ x2-x1 5 of 16 The y intercept The y intercept is the point at which the line crosses the y axis (represented by a c) 6 of 16 The equation of a straight line y= mx+c (gradientx+ y intercept) 7 of 16 Circumference of a circle (pie)d or 2(pie)r2 8 of 16 Circumference of semi-circle (circ. of entire circle) (pie)/ 2 9 of 16 Area of triangle bh/2 10 of 16 Volume of a cylinder (pie)r2l or (pie)r2h 11 of 16 Volume of a cuboid lxbxh 12 of 16 Volume of a prism C.S.A x l 13 of 16 Area of a sector (theta)/360 x (pie)r2 14 of 16 Arc length (Theta)/360 x 2(pie)r 15 of 16 Perimeter (theta)/360 x 2(pie)r + 2r 16 of 16
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