Tag Archives: Primary 5

Primary 5 CA2 Revision 1

P5-CA2-Ex 1

Ans:

1–  3

2–  1

3–  2

Area of square –>  8 cm × 10 cm = 80 cm²

Base of tri­an­gle –>  14 cm — 8 cm = 6 cm

Area of tri­an­gle –>  1/2 × 6 cm × 10 cm = 30 cm

80 cm + 30 cm = 110 cm²

 

4–  3

5–  2

1 hour –> 60 min × 60 = 3600 sec

3600/100 = 36 sets of 100 seconds

36 × 10 = 360 lol­lipops

 

6–  2

11.00 a.m. to 12 p.m. –> $2

12 p.m. to 2.30 p.m. –>  2.5 hours ≈ 3 hours –> 3 × $1 = $3

$3 + $2 = $5

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Primary 5 July Review 3

P5-Jul-Review 3

Ans:

1–  2

2–  2

3–  2

4–  4

5–  3

0.8 = 8/10 = 4/5

Left–>  5/5 — 4/5 = 1/5

1u –> $3420

$3420 ×  4 = $13 680

 

6–  4

7–  1

Total amount of sugar –>  21 × 4 kg = 84 kg

84/8 = 10 4/8 = 10  1/2 kg

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Primary 5 June Review 1

P5-June-Review 1

Ans:

1–  3

2–  3

3–  2

4–  3

5–  1

6–  2

7–  2

8–  4

40 : 45 = 8 : 9 = 16 : 18

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Primary 5 SA1 Revision 5

P5-SA1-Ex 5

Ans:

1–  200 0002 hun­dred thousands

2–  15 600

3–  298

4–  9

5–  9 : 7

$81 — $18 = $63 (Marianne’s)

Ali­son   :   Mar­i­anne
81       :      63
–>    9     : 7

 

6–  3

15 × 3/10 = 4 1/2

4   1/2 ÷  3/2 = 3

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Primary 5 Ratio Level 1 Ex 5

P5-Ratio-L1-Ex 5

Ans:

1–  2

2–  4

3–  3

Local   :   For­eign
3        : 5

3u + 5u = 8u

8u –>  120 stamps

1u –>  120/8 = 15 stamps

15 × 3 = 45 local stamps

 

4–  3

5–  3

Perime­ter –>  Length + Breadth + Length + Breadth
->     3u        +    1u         +    3u       +      1u  = 8u

8u –> 40 cm

1u –>  40/ 8 = 5 cm

5 cm × 3 = 15 cm

 

6–  3

Son’s age –>  42 — 28 = 14 years old

42  :  14 =  3  : 1

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Primary 5 March Review 3

P5-Mar-Review 3

Ans:

1–  3

2–  3

4  1/4 = 17/4

17/4 = 34/8

 

3–  4

4–  2

Length of String Q –>  3  1/5 m —  1  2/3 m = 1  8/15 m

1  8/15 m + 3  1/5 m = 4  11/15 m

 

5–  2

Remain­ing pizza after Joseph had eaten it –>  8/8 — 1/8 = 7/8

4/5 × 7/8 = 7/10

 

6–  1

Breadth of rec­tan­gle–>  (48 cm÷ 2) — 14 cm = 10 cm

14 cm × 10 cm = 140 cm²

 

7–  2

8–  2

(24 sweets  cost the same as 18 choco­lates )  ÷ 3

8 sweets cost the same as 6 chocolates

18 — 6 = 12 choco­lates 

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Primary 5 Volume Level 3 Ex 2

P5-Volume-L3-Ex 2

Ans:

1–  32 768 cm³ 32.768 l

3/4 — 5/8 = 1/8 poured out

1/8 × 64 cm × 64 cm × 64 cm = 32 768 cm³ / 32.768 l

 

2–  16 800 cm³16.8 l

3–  300 ml

4/5 — 1/2 = 3/10 filled

3/10 × 10 cm × 10 cm × 10 cm = 300 cm³ = 300 ml

 

4–  720 ml

8 cm — 5 cm = 3 cm

Amount of water poured out –>  40 cm × 30 cm × 3 cm = 3600 cm³

3600 cm³ ÷ 5 = 720 cm³ = 720 ml

 

5–  25 cm

Length   :   Breadth
4        : 1

4u — 1u = 3u

3u –>  6 cm

1u –>  2 cm –>  breadth

Length –>  2 cm × 4 = 8 cm

Base area –>  2 cm × 8 cm = 16 cm²

400 ÷ 16 = 25 cm

 

6–  17.5 cm

1600 cm³ ÷ 640 cm² = 2.5 cm

2.5 cm + 15 cm = 17.5 cm

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Primary 5 September Review 1

P5-Sep-Review 1

Ans:

1–  3

2–  2

3–  3

4–  4

7u –> $756

1u –> $108

10u–>  $108 × 10 = $1080

 

5–  1

6–  3

80% –> $1800

1% –>  $22.50

100% –>  $22.50 × 100 =  $2250

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Primary 3 Fractions Level 1 Ex 1

P3-Fractions-L1-Ex1

Ans:

1–  4

2–  2

3–  4

4/16 = 1/4

 

4–  1

5–  3

6–  2

7–  1

Total num­ber of daisies –>  2 + 3 + 4 = 9

3/9 = 1/3 

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Primary 5 Average Level 3 Ex 4

P5-Average-L3-Ex4

Ans:

1–  432 more stamps

Total num­ber of stamps Jamie and Patrick had ->  360 × 2 = 720

Patrick -> 1u

Jamie -> 4u

5u –>  720 stamps

1u –>  144 stamps

4u — 1u = 3u

3 × 144 = 432 more stamps

 

2–  71.5 kg

Total mass of 3 boys if they weigh as much as Derek –>  75 × 3 + 12 + 9 = 246 kg

Derek’s mass  –>  246 kg ÷ 3 = 82 kg

Joe’s actual mass ->    82 kg — 12 kg = 70 kg

Ron’s actual mass ->  82 kg — 9 kg = 73 kg

Aver­age mass of Joe and Ron –>  (70 + 73) ÷ 2 =  71.5 kg

3–  5.8 m

Total mass of the pole, plank and rod –>  4.8 m × 3 = 14.4 m

Rod –> 1u

Pole –> 2u

Plank –>  2u + 0.4 m

5u +  0.4 m ->  14.4 m

5u –>  14.4 m — 0.4 m = 14 m

Rod  –>  14 m ÷ 5 = 2.8 m

Pole –>  2.8 m × 2 = 5.6 m

Plank –>  2.8 m × 2 + 0.4 = 6 m

Aver­age length of pole and plank –>  (5.6 m + 6 m ) ÷ 2 = 5.8 m

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