381 P5.ST.JC.18121204
Level 3
The average cost of some books is $30.
When a book that costs $90 is removed,
the average cost of the books becomes $10.
How many books are there in the end?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
382 P6.ST.JC.18121420
Level 3
Fill in the blanks.
Number of boys at first is 30% of the children.
Number of boys is then increased to 40%.

  1. Number of boys at first = _____ u
  2. Number of boys in the end = _____ u
  3. Increase in the number of boys = _____ u
  4. Number of children in the end = _____ u
4 m
Percent to units Percent change to Unchanged quantity Units table
383 P6.ME.JC.19072704
Level 2 PSLE
3 children rented 2 computers from 4.15 p.m. to 5.00 p.m. and took turns to play games on them. At any time, 2 of them played on the computers while the other child watched. If each of them had the same amount of playing time, how many minutes did each child get?
2 m
Duration Start end time am pm Equal stage Units method
384 P6.PC.NK.21060204
Level 2 PSLE
A dancing club has 100 male and 50 female members. 10% of the male members and 40% of the female members are students. What percentage of the members are students?
2 m
Percent of a set Percent of different bases F Multiplication Units table
385 P6.AP.NK.21060405
Level 2 PSLE
Figure 1 shows a rectangular tile with a perimeter of 28 cm. Figure 2 is formed using 5 such tiles. Find the perimeter of Figure 2.
2 m
Rectangle Rectilinear figure Tiling Units & parts Substitution
386 P6.RA.TL.16010102
Level 2
The ratio of coconuts to mangosteens is 2 : 7. If 348 mangosteens are added, the ratio of coconuts to mangosteens will be 2 : 11. How many more mangosteens than coconuts are there in the end?
2 m
Ratio to units More than or less than Unchanged quantity Units table
387 P6.AG.JC.17080424
Level 2
The average mass of Lynn and Joan is 18p kg. If Joan is 4p kg lighter than Lynn, find Lynn's mass in kg.
2 m
Algebra in 1 variable Algebra simplifying Mass Average More than or less than Units method
388 P6.FR.JC.17053001
Level 2 PSLE
Andy and Ben shared the total cost of a present. Andy paid $15 more than 38 of the cost of the present. Ben paid $25. How much did the present cost?
2 m
Fraction to units Money More than or less than Units method
389 P4.ME.JM.17100349
Level 2
7 120 kg -            g = 3 kg 485 g
2 m
Mass Unit conversion W Addition & subtraction Fractions with units
390 P5.RA.JM.17083136
Level 2
The ratio of three sides of a triangle is 4 : 5 : 3. If the perimeter of the triangle is 60 cm, how long is the longest side of the triangle?
2 m
Ratio to units Area Perimeter Units method
391 P4.ST.JC.18120972
Level 1
Adam saves $8.70.
He saves 3 times as much as Bryan.
How much does Adam save more than Bryan?
2 m
D Multiplication D Division More than or less than Model Times-as-many Units method
392 P3.ST.JC.18120924
Level 3
Adam buys 4 identical stickers and 4 marbles for $80.
How much will Adam pay if she buys 5 such stickers and marbles?
4 m
W Multiplication & division Proportion Units & parts
393 P6.DE.JO.21060205
Level 1 PSLE
5000 mℓ of water was poured into 2 containers equally. How many litres of water were there in one container?
2 m
D Division MRDL Volume Unit conversion Units method
394 P5.ST.JC.18121205
Level 3
The average cost of some books is $30.
If 3 of the books are now each $15 more,
the average cost of the books becomes $35.
How many books are there altogether?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
395 P6.ST.JC.18121421
Level 3
Fill in the blanks.
Number of boys at first is 40% of the children.
Number of boys is then decreased to 30%.

  1. Number of boys at first = _____ u
  2. Number of boys in the end = _____ u
  3. Decrease in the number of boys = _____ u
  4. Number of children in the end = _____ u
4 m
Percent to units Percent change to Unchanged quantity Units table
396 P6.ME.NK.21060320
Level 2 PSLE
Pauline answered 40 questions in a quiz. She took 3 min for each of the first 10 questions and twice as long for each of the remaining questions. The quiz started at 1.45 p.m. At what time did she complete the quiz?
2 m
Time Unit conversion Start end time Duration Timeline Times as many Units method
397 P6.AP.JC.22040802
Level 2 PSLE
In Figure 1, the total perimeter of 4 rectangles X and square Y is 152 cm. They are joined to form a large square in Figure 2 which has a perimeter of 56 cm. Find the length of one side of square Y.
2 m
Length Square Rectangle Units & parts Elimination
398 P6.AG.JC.17080429
Level 3
During a sale, a watch with a selling price of $180 was given 2n% discount. If Fina bought it at the discounted price, how much did she save?
2 m
Algebra in 1 variable Discount Units method
399 P5.RA.JM.17083133
Level 2
Patricia is preparing a fruit punch by mixing syrup with water in the ratio of 2 : 3. How much syrup is needed if 18 litres of water is used?
2 m
Ratio to units Volume Units method
400 P4.AN.JM.17092804
Level 2
In the figure, AB is perpendicular to BC. ∠ABD is twice as large as ∠CBD. Find ∠ABD.
2 m
Right angle Model Times-as-many Units method

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