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2019 PSLE paper 2

(a) 22cm-16cm=6cm

6cm+6cm+16cm=28 cm

(b)circumference of semicircle : 28xpi=87.96cm (rounded down)

Perimeter of figure : 87.96cmx5=439.8cm

439.8cm+22cm+12cm+16cm+12cm+22cm=523.8 cm

Ans : (a)28cm

(b)523.8cm

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(A) 22-16=6

16+6+6=28. Ans(28cm)

(B) 28x pi x1/2=43.98 (rounded)

43.98x5=219.9

219.9+22+22+12+12+16=303.9 Ans(303.9cm)

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22-12=10

16+10+10=36

(a)ans:36cm

pi x 36/2=56.549

56.549x5=282.745

282.745+12+12+16+22+22=366.745

366.745=366.75

(b)ans:366.75cm

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a)

3d+12+12=2d+22+16+22

3d+24=2d+60

3d-2d=1d

1d=60-24=36

ans:36cm

b)

circumference of semi circle=pix36x1/2=56.548866776

56.548866776X5=282.7433388

282.7433388+12+22+16+12+22=366.7433388

Round off to 366.74

Ans :366.74cm

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A) 22-12=10

10+10+16=36

Ans a: 36cm

B) pi x 36cm = 113.1

113.1 x 5=565.5

565.5 + 22 + 12 + 16 + 12 + 22 =649.5

Ans b: 649.5cm

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ANSWER CHANGE:b)After that, do 342.74+12+12=366.74

Answer: 366.74cm

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22-12=10

16+10+10=36cm(ans)

Pi X 36/2=56.549

56.549x 5=282.745

282.745+22+16+22+12+12=366.74(Ans)

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22cm-12cm=10cm

10cm+16cm+10cm=36cm (Diameter of the semicircle)

1 out of 2xcalculator pi x 36=56.54866776cm2

5x56.54866776=282.7433388cm2

282.7433388cm2+16cm+12cm+12cm+22cm+22cm=366.7433388cm2

366.7433388cm2 rounded to 2 decimal places=366.74cm2

Ans(a): 36cm

Ans(b): 366.74cm2

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(A)1. 5xpiex34=53.41(ans)

(B)53.41x5=267.05

267.05+22+12+16+12+22=351. 05 (ans)

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2019 PSLE Paper 2

(A)

22-16=6

Ans=16+6+6=28

(B)=28/2=14

14xpi=43.98

5 Circumference =43.98x5=219.91

Perimeter=219.91+22+12+16+12+22=303.91

Ans(a)=28cm

Ans(b)=303.91cm

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22-12=10

10+10+16=36

5x36x0.5xPI=282.74

282.74+22+12+16+12+22=366.74

A)Ans:36cm

B)Ans:366.74cm2

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2019

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22-12=10

10+10+16=36

ANS =36cm

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(a) 3d+12+12= straight line

2d +22+16+22=straight line

22+16+22=60

Diameter=60-12-12=36

Ans:36cm

(B)36xpi x half= 56.54866776

56.54866776x5=282.7433388

282.7433388+12+22+16+12+22=366.74(rounded)

Ans366.74cm

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Q16

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(a)22cm-12cm=10 cm

22+10cm=32 cm

Ans(a):32cm

(b)5x1/2x2x11xcalculator pie=172.785

22+12+16+12+22=84

172.785+84=256.785

Ans(b):256.785

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a) 22-12=10

22-12=10

Diameter of each semicircle=16+10+10

=36

a)Ans:36cm

b)Arc of one semicircle=1/2xpix36

=18pi

5 Arcs=18pix5

=90pi

Total perimeter=90pi+22+12+16+12+22

=366.743

Rounded off to 366.74cm

b)Ans:366.74cm

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a) 22cm-12cm=10cm

16cm+10cm+10cm=36cm

b) arc 1+arc 2+arc 3+arc 4 =2 circles

Circumference of 2 circles: (pi x 36cm)x2=226.19cm

Perimeter of arc 5: 1/2 x pi x 36cm =56.55cm

Perimeter of figure: 226.19cm+56.55cm+(22cmx2)+(12cmx2)+16cm=366.74cm

Ans: a) 36cm

b) 366.74cm

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Diameter=22+16=38

Ans=38cm

Perimeter=1/2xPi x38=59.690

59.690x5=298.45

298.45+22+12+16+12+22=463.45

Ans=463.45cm

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B) I think it’s calculation errors

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A) 22+12+16+12+22=84

84/2=42

Ans=42

B)1/2x pi x 42 =65.97

65.97 x 5 =329.85

329.85 + 22 +12 +16 +12 + 22=413.85

Ans= 413.85

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16(a): 22+12=34

16(b): 1/2x34x pi=53.40707511

53.40707511x5=267.0353756

267.0353756+22+12+16+12+22=351.0353756( rounded off to 351.04)

a)Ans: 34cm

b)Ans: 351.04cm

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I did not know how to do the question as I had never encountered it before so I tried my best but did not get it right I feel like if I did it again I would be able to get it right.

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Diameter:22-12=10

16+10+10=36

1/2xpix36=56.55

56.55x5=282.75

282.75+22+12+16+12+22=366.75

(A)Ans=36cm

(B)Ans=366.75cm2

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A) 22-12=6

16+6+6=28

Ans:28cm

B)1/2xpiex28=43.982

43.982 rounded to 43.98

43.98-6-6-16=15.98

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Individual Work - Spend 5 min to review this question;

Pair Work - Spend another 5 min to solve this question;

Class discussion - 5 min

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(A)ans:28cm

22-16=6

22+6=28

(B)ans:303.9114858cm

1/2x28xpie=43.98229715

43.98229715x5=219.9114858

219.9114858+22+12+16+12+22=303.9114858cm

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16cm-12cm=4 cm

22cm+4cm=26 cm

26cm-16cm=10cm

10cmx2+16cm=36cm

Or

20cm+16cm=36cm

Ans:a 36cm

1/2x5=2.5

2.5x pi x 36 is 282.74 to 2dp

282.74cm +22cm+12cm+16cm+12cm+22cm =366.74 cm ans

Ans:b 366.74cm

Ans a 36cm

Ans b 366.74cm

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22 -16=6 ( 6 is the unknown side, the right one next to the circle with 16cm)

(a) 22+6= 28

(b) calculator pi x 1/2 x 28 =43.982 (circumference of semi circle)

43.982 corrected to 2 d,c is : 43.98

43.98 x 5 (semi) = 219.9

219.9+ 22+12+16+12+22=303.9

a) 28 cm

b) 303.9 cm

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I could not do the question as I thought the lines were even.

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22-16=6

6x6=36

Ans (a) 36cm

1/2 x pi x36=56.548

56.548x5=282.74

282.74+16+22+22+12+12=366.74

Ans 366.74cm

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22-16=6

6x6=36

A)36cm

36/2=18

18xpi=56.548

56.548x5=282.740

282.7+12+12+16+22+22=366.7 4

Ans:366.74cm

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22-12=10

10+10+16=36

A=36cm

1/2x36xpi=56.548

56.548x5=282.74

282.74+22+16+22=342.74

B=342.74

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A:

22-16=6

6+6+16=28

B:

1/2xpix28=43.982

43.98x5=219.9 1

219.91+22+12+16+12+22=303.91

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Question 16:

I think I got the question wrong because I could not visualise that the top half is the same as the bottom half.

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I did not know how to do as a thought it was equal length, I got A wrong. But I thought and realised it was not equal.

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I could not visualise the semicircles

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I could not visualise the circles . But after I looked at it, but I still didn’t understand.

So, I went home and now I understand question .

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I got this wrong because l did not visualise it properly

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2019 PSLE Paper 2 Q16

I did not realise the centre line was the same for both sides, but instead I thought it was a 2:3 ratio.

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I like the way bennet and Xavier solved the question. Their method is more efficient and clear.

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I got it wrong as I think that I could not visualise the semicircles