Ans:
1– 8 chocolates
2– $196
3– $50
4– $5600
5– 224 girls
6– $55
7– 54 years old
8– 61 years old
9– 20 years
10– $846
11– $520
12– 310 g
13– a -> 3/10 , b -> $8 more
14– 84 rambutans
15– a -> 8 dogs , b -> 60 cans
16– $900
17– a -> $7012 , b-> $10 512
18– Alicia – 168 stickers , Bella -> 72 stickers , Camilla -> 48 stickers
Posted in March, Primary 5, Problem Sums
Tagged difficult, heuristic, Primary 5, problem solving, PSLE, Singapore, word problems, Worksheets
Ans:
1– $54
2– 192p cm²
3– 140 m
4– 5 guests
5– 11 116 cm³
6– 10 more girls
7– $0.10 / 10¢
8– $6
9– a-> $1250 , b-> $6500
10– 64 stickers
11– 18.56 l
12– a-> 360 km , b-> 120 km/h
13– a-> 75 pencils , b-> $0.60/ 60¢
14– 99 blue pens
15– Kelvin -> $28 , Irene -> $12
16– 25%
17– 80 km/h
18– 100 cm
Posted in Primary 6, Problem Sums, September
Tagged difficult, heuristic, Paper 2, Primary 6, problem solving, problem sums, PSLE, revision, September, Singapore, word problems, Worksheets
Ans:
1– 15 more boys
2– 54 cm
3– a-> 15 pupils , b-> 17 sweets
4– 4 50-cent coins and 6 20-cent coins
5– 2268 cm³
6– 14 kg
7– $150
8– $12
9– 1920 m / 1.92 km
10– a-> 6 : 35 : 21 , b-> 144 guests
11– $140
12– 99.7 cm²
13– a-> $280 , b-> $252
14– a-> 16 l , b-> 15 pails
15– a-> 1800 parcels , b-> $720
16– $1220
17– a-> See attached Qn 17 , b-> 20 cm , c-> 5933 cm²
18– 3 km
Posted in Problem Sums, PSLE, Revision, September
Tagged difficult, heuristic, Paper 2, Primary 6, problem solving, problem sums, PSLE, revision, September, Singapore, word problems, Worksheets
Ans:
1– 123
2– 5.94, 9.54, 10.05, 10.5
3– 27
4– 96
5– x – 5
6– 16 cm
7– 1 : 2
8– 12 years 3 months
9– $20
10– 12n² cm³
11– 4 h 45 min
12– See attached Qn 12
13– 10 years old
14– $258.50
15– 750 – 8y / (y + 20) notebooks
Ans:
1– 2.28
2– 15%
3– 14 : 3
4– 3 hours
5– $11.70
6– 350 cm²
7– 24 days
8– 47 cm
9–$662
10– 400 cm²
11– 4032
12– 7.50 a.m.
13– 126
14– 7 : 2 : 1
15– 1 9/11 min
Ans:
1– $(21 + 3x)
2– 78.3 m/min
3– a-> 13 × 14 , b-> 14 × 15
4– 3474 trees
5– 2070 coins
6– 15 years’ time
7– 15 chicken wings
8– 30 red pens
9– $252
10– 12.24 p.m.
11– 13 marbles
12– a-> 44 cm , b-> 28 cm²
13– 4.185 l
14– a-> 115 defective jackets , b-> $1610
15– 580 passengers
16– 396 cards
17– 3 h 45 min/ 3 3/4 h
18– a-> 9 , b-> 30 , c-> 100 , d-> 650 , 2500
Posted in Primary 6, Problem Sums, PSLE, Revision, September
Tagged difficult, heuristic, Paper 2, Primary 6, problem solving, problem sums, PSLE, revision, September, Singapore, word problems
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 felt 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 !
