SPM 2018 Add Maths Paper 1, Question 15Progressions

Solved on video in English and Bahasa Melayu · 3 marks · Form 4, Progressions · 4:26 video

The question

A student has a wire with the length of 13.16 m. The student divided the wire into several pieces. Each piece is to form a square. Diagram 7 shows the first three squares formed by the student. How many squares can be formed by the student?

[3 marks]

SPM 2018 Add Maths Paper 1, Question 15: the question as drawn in Eduly's video4:26

Step 1

The perimeter of a square is 4 x side length, so the first three squares (sides 4, 7, 10 cm) have perimeters 16 cm, 28 cm and 40 cm.

Why this step

The wire wraps around the edge of each square, so the length used is the perimeter, not the side. Adding sides is a common mistake.

9 more steps, each with the reason for it, in the full solution

Final answer

14 squares

Where students lose marks

Watch out: convert 13.16 m to 1316 cm first, and sum the perimeters (16, 28, 40, …) with Sn, not the side lengths.

Watch every step of this question solved on video (4:26), with the reason behind each step and a box that checks your own answer.

Start 7 days freeAlready a member? Watch it now

No card. Every past-year question on video, in English and BM.

All questions in SPM 2018 Paper 1

Progressions: lessons and every past-year question

Baca dalam Bahasa Melayu

More Progressions questions

Questions are re-typeset by Eduly for study and commentary. Eduly is not affiliated with Lembaga Peperiksaan Malaysia or the Ministry of Education.