Ans:

1– **1**

2– **4**

75 × 5 = 375

375 + 90 = **465**

3– **4**

4– **1**

5– **4**

14 hundreds and 47 tens = 1400 + 470 = 1870

1870 + 847 = **2717**

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Ans:

1– **1**

2– **4**

75 × 5 = 375

375 + 90 = **465**

3– **4**

4– **1**

5– **4**

14 hundreds and 47 tens = 1400 + 470 = 1870

1870 + 847 = **2717**

Tagged Maths, Primary 3, Review Paper, revision, Singapore Maths, Worksheets

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Ans:

1– See below

2– **9360 cm³**

Height of water needed to fill the container –> 25 cm — 18.5 cm = 6.5 cm

45 cm × 32 cm × 6.5 cm = **9360 cm³**

3– **68 buttons**

36 + 3 = 39 more buttons

8 — 5 = 3 buttons

∴ She needs 39 more buttons because she is putting 3 more buttons into each box.

39 ÷ 3 = 13 boxes

13 × 5 + 3 = **68 buttons**

4– **$580**

107% –> $465.45

100% –> $435 (discounted price without GST)

75% –> $435

100% –> 435/75 × 100 = **$580**

5– **136 children**

40% = 40/100 = 2/5

~~2~~/3 of the boys = ~~2~~/5 of the girls

Boys : Girls

3 : 5

2u –> 34

1u –> 17

17 × 8 = **136 children **

Posted in Primary 6, Problem Sums

Tagged difficult, heuristic, Maths, Primary 6, problem sums, PSLE, revision, Singapore Maths, word problems, Worksheets

With the PSLE just around the corner, this is a great time to remind all the kids taking the Maths paper to work on their time management. I always feel it would help if I had an extra 10 minutes.

**Paper 1 -> 30 questions, 50 minutes**

50 ÷ 30 ≈ 1.6 min per question.

**Paper 2 -> 18 questions (5 Short-answer questions + 13 Long-answer questions), 1 hour 40 min**

SAQ -> 15 min

15 ÷ 5 = 3 min per question

LAQ-> 1 hour 25 min

85 ÷ 13 ≈ 7.5 min per question

Well, even with this estimation, the kids have to be really meticulous with their work as I have not left any time for checking. Ideally, of course, it would be good to leave 15% of the time allocated to do some checking.

Well, good luck to the kids taking the PSLE! The next few weeks, make sure they are familiar with all the common problem sums. They should be well-prepared for Paper 1 too. Nothing less than 34/40 !

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**

Tagged Maths, Primary 5, Review Paper, revision, Singapore, Singapore Maths, Worksheets

Ans:

1– **3**

2– **3**

3– **2**

4– **4**

5– **4**

7.25 a.m. to 9.25 a.m (2 hour) –> 8 quarter-turns

8.25 a.m. to 9.40 a.m. (15 min) –> 1 quarter turn

8 + 1 = **9 **

Tagged Maths, Paper 1, Primary 4, Review Paper, revision, Singapore, Singapore Maths, Worksheets

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 **

Posted in Fractions, Primary 3

Tagged easy, Fractions, Maths, Paper 2, Primary 5, Singapore Maths, Worksheets

Ans:

1– **4**

2– **1**

Total of the 4 numbers –> 4 × 22 = 88

88 — 24 — 26 — 28 = **10**

3– **1**

4– **4**

15/60 × 300 km = 75 km

75 km = **75 000 m**

5– **4**

6– **4**

5/5 — 2/5 = 4/5 (owned cats and dogs)

3/5 –> 48 + 72 = 120 children

1/5 –> 40 children

5/5 –> 40 × 5 = **200 children**

Tagged Maths, Primary 6, PSLE, Review Paper, revision, Singapore, Singapore Maths, Worksheets

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**

Tagged Average, difficult, Level 3, Maths, Primary 5, problem sums, revision, Singapore, Singapore Maths, word problems, Worksheets

Ans:

1– **$9153**

$2178 + $6975 = **$9153**

2– **5 5/12 kg**

The total mass of the nails–> 9 11/12 kg — 11/12 kg = 9 kg

Mass of the nails when they are half-filled –> 9 /2 = 4 1/2 kg

4 1/2 kg + 11/12 kg = **5 5/12 kg**

3– **3456 canned drinks**

128 × 27 = **3456 canned drinks**

4– **56.58 kg**

6u –> 169.74 kg

1u –> 28.29 kg

28.29 kg × 2 = **56.58 kg**

Posted in Primary 4, Problem Sums

Tagged difficult, Heuristics, Maths, Primary 4, problem solving, problem sums, revision, Singapore Maths, word problems