Secondary 2 topics, working towards the O-Level Mathematics 4052 syllabus. Every question below has a full worked solution.
When a student gets a question wrong in Math Amigo, it does not show the answer straight away. It
reads the working, identifies the step that went wrong, and asks a question that points at the
correction. The worked solution is there once a genuine attempt has been made.
The frequency table below shows how many times per week 25 students drink bubble tea. What fraction of students drink bubble tea at most 2 times per week? Give your answer as a fraction in its simplest form.
Times per week
0
1
2
3
4
5
6
Frequency
1
4
1
7
1
10
1
Show the worked solution
Count drinking≤2:1+4+1
=6
Fraction=256
Answer: 6/25
Example 2
The back-to-back stem-and-leaf diagram below shows the daily screen times, in minutes, of two year groups. How much greater is the range for Year 2 than the range for Year 1?
Year 1
Stem
Year 2
8 6 5
6
0 1 4 5 9
9 6 3
7
0 1 3 5 9
8 7 6 3
8
1 3 4 5 6
7 5 4 3 0
9
8
Key: 6 | 0 means 60 minutes
Show the worked solution
Range for Year 1=97−65
=32
Range for Year 2=98−60
=38
Difference=38−32
=6
Answer: 6
Example 3
The grouped frequency table below shows the heights of students. Find the number of data values such that 170≤x<190.
Height (x cm)
Frequency
150 ≤ x < 160
3
160 ≤ x < 170
15
170 ≤ x < 180
15
180 ≤ x < 190
8
190 ≤ x < 200
14
Show the worked solution
Class intervals in the range 170≤x<190:
170≤x<180: frequency =15
180≤x<190: frequency =8
Total count=15+8
=23
Answer: 23
Questions parents ask
Is it really free?
The free plan is permanent and does not ask for a card. It has daily limits on the AI feedback, and the paid plans lift them.
Which syllabus does this follow?
O-Level Mathematics (4052), for Singapore secondary students. Math Amigo covers Secondary 1 to 4, both O-Level Mathematics and Additional Mathematics.
Will it just show my child the answer?
No. On a wrong answer it looks at the working, points to the step that went wrong, and asks a question that helps the student find the correction. The full worked solution is available after a genuine attempt.