Year 10 Exam Revision 2 Groups of 4 Pupil A,B,C,D 1 point for each pupil

Expand and simplify A 3(2x-1)+4(x+3) B 5(2x+3)+3(x+2) C 4(2x+1)-2(x+3) D 5(3X-1)-2(X-5)

Expand and simplify ANSWERS A 3(2x-1)+4(x+3) 6X-3+4X+1210X+9 B 5(2x+3)+3(x+2) 10x+15+3x+613x+21 C 4(2x+1)-2(x+3) 8x x -6 6x -2 D 5(3X-1)-2(X-5) 15x – 5 -2x x + 5

Nth term of a sequence Write down the 1 st, 2 nd and 3 rd terms 4n+1 4n+1 5n-2 5n-2 2n+7 2n+7 3n-2 3n-2

Nth term of a sequence ANSWERS Write down the 1 st and 2 nd terms 4n+1 means x4 then +1 4n+1 means x4 then +1 N=1 1x4+1=5 N=1 1x4+1=5 N=2 2x4+1=9 N=2 2x4+1=9 5n-2 5n-2 N=1 1x5-2=3 N=1 1x5-2=3 N=2 2x5-2=8 N=2 2x5-2=8 2n+7 2n+7 N=1 1x2+7=9 N=1 1x2+7=9 N=2 2x2+7=9 N=2 2x2+7=9 3n-2 3n-2 N=1 1X3-2=1 N=1 1X3-2=1 N=2 2X3-2=6 N=2 2X3-2=6

Simplify by collecting like terms 4a + 2b + 3a + 3b 4a + 2b + 3a + 3b 5x + 4y – 2x + 10y 5x + 4y – 2x + 10y 3x + 10y + 2x + y – x 3x + 10y + 2x + y – x 6a + 3b – a + b – 2a 6a + 3b – a + b – 2a

Simplify by collecting like terms ANSWERS 4a + 2b + 3a + 3b 4a + 2b + 3a + 3b 7a + 5b 7a + 5b 5x + 4y – 2x + 10y 5x + 4y – 2x + 10y 3x + 14y 3x + 14y 3x + 10y + 2x + y – x 3x + 10y + 2x + y – x 4x + 11y 4x + 11y 6a + 3b – a + b – 2a 6a + 3b – a + b – 2a 3a + 4b 3a + 4b

Factorise by putting back into brackets 2a a a a + 30 y 2 + 3y y 2 + 3y b 2 – 7b b 2 – 7b

Factorise by putting back into brackets ANSWERS 2a a (a + 5) 2(a + 5) 5a a (a + 6) 5(a + 6) y 2 + 3y y 2 + 3y y(y+3) y(y+3) b 2 – 7b b 2 – 7b b(b – 7) b(b – 7)

Plot the following coordinates, join them up then find the coordinates of the mid-point (1,1) and (5,5) (1,1) and (5,5) (2,10) and (4,4) (2,10) and (4,4) (6,3) and (9,4) (6,3) and (9,4) (6,10) and (8,7) (6,10) and (8,7)

Plot the following coordinates, join them up then find the coordinates of the mid-point ANSWERS (1,1) and (5,5) (3,3) (1,1) and (5,5) (3,3) (2,10) and (4,4) (3,7) (2,10) and (4,4) (3,7) (6,3) and (9,4) (7.5,3.5) (6,3) and (9,4) (7.5,3.5) (6,10) and (8,7) (7,8.5) (6,10) and (8,7) (7,8.5)

Find the area of these shapes 6cm 6cm 2cm 2cm 4cm 4cm 7cm 7cm 6cm 6cm 12cm 12cm

Find the area of these shapes ANSWERS 6cm 6cm 2cm 6x=12cm 2 2cm 6x=12cm 2 4cm 4x7=28 4cm 4x7=28 7cm 28÷2 = 14cm 2 7cm 28÷2 = 14cm 2 6cm 6x12=72 6cm 6x12=72 12cm 72÷2=36cm 2 12cm 72÷2=36cm 2

Calculate the mean Age(years)Frequency

Calculate the mean ANSWERS Age(years)Frequency Age x freq Mean = 143 ÷ 30 = 4.7

Calculate the mean Height (cm) Frequency 10 h < h < h < h < 50 2

Calculate the mean ANSWERS Height (cm) Frequency Midpoint x freq 10 h < x3=45 20 h < x7= h < x8= h < x2= Mean = 590 ÷ 20 = 29.5 cm

Expanding double brackets (x + 2)(x + 7) (x + 2)(x + 7) (x + 6)(x – 3) (x + 6)(x – 3) (x + 5) 2 (x + 5) 2 (x + 7) 2 (x + 7) 2

Expanding double brackets ANSWERS (x + 2)(x + 7) X 2 +9X+14 (x + 2)(x + 7) X 2 +9X+14 (x + 6)(x – 3) X 2 + 3X - 18 (x + 6)(x – 3) X 2 + 3X - 18 (x + 5) 2 = (X+5)(X+5) X X + 25 (x + 5) 2 = (X+5)(X+5) X X + 25 (x + 7) 2 = (X+7)(X+7) X X + 49 (x + 7) 2 = (X+7)(X+7) X X + 49 X2 X X2X2X2X22X 77X14

Calculate the circumference of a circle. REMEMBER C= πd REMEMBER C= πd 10cm 7cm 6cm

Calculate the circumference of a circle. ANSWERS REMEMBER C= πd REMEMBER C= πd C = 3.14 x 10=31.4 c=3.14 x 7 = C = 3.14 x 10=31.4 c=3.14 x 7 = D=12 so c=3.14 x 12 = D=12 so c=3.14 x 12 = cm 7cm 6cm

Calculate the area of a circle. REMEMBER a= πr 2 REMEMBER a= πr 2 10cm 7cm 6cm

Calculate the area of a circle. ANSWERS REMEMBER a= πr 2 REMEMBER a= πr 2 A=3.14 x 10 2 =314 A=3.14 x 7 2 = A=3.14 x 10 2 =314 A=3.14 x 7 2 = R=3 so A=3.14 x 3 2 = R=3 so A=3.14 x 3 2 = cm 7cm 6cm

Write these numbers in standard form

Write these numbers in standard form ANSWERS X X X X X X X X 10 -2

Compound interest. £3000 invested at 2% at 5 years £3000 invested at 2% at 5 years £2400 invested at 4% for 3 years £2400 invested at 4% for 3 years £600 invested at 6% for 2 years £600 invested at 6% for 2 years £2500 invested at 4.1% for 3 years £2500 invested at 4.1% for 3 years

Compound interest. ANSWERS £3000 invested at 2% at 5 years £3000 invested at 2% at 5 years 3000 X = £ X = £ £2400 invested at 4% for 3 years £2400 invested at 4% for 3 years 2400 X = £ X = £ £600 invested at 6% for 2 years £600 invested at 6% for 2 years 600 X = £ X = £ £2500 invested at 4.1% for 3 years £2500 invested at 4.1% for 3 years 2500 X = £ X = £

Histograms. Work out the frequency density then draw the histogram Work out the frequency density then draw the histogram Height (cm) Frequency 0 < h < h < h < h

Histograms. ANSWERS Work out the frequency density then draw the histogram Work out the frequency density then draw the histogram Height (cm) Frequency F ÷ class width 0 < h ÷ 10 = 4 10 < h ÷ 5 = 6 15 < h ÷ 15 = 2 30 < h ÷ 20 = 5 Height Freq Density