Singapore Math Level 2A & 2B – Unit 16 covers Lines and Surfaces in detail. This unit explores different types of lines, their properties, and the concepts of flat and curved surfaces. With clear explanations and examples, students will develop a solid understanding of lines and surfaces.
Singapore Math Level 2A & 2B – Unit 16: Lines And Surfaces
1. This picture is formed using straight lines and curves.
(a) How many straight lines are there? 2 straight lines
(b) How many curves are there? 2 curves
2. The object below is made from a tissue box and a toilet paper roll.
How many flat surfaces does the object have? 5 flat surfaces
Unit 16: LINES AND SURFACES
1. Look at the below digits.
| 2 | 3 | 4 | 5 | 7 | 8 |
Which of the above digits have
(a) straight lines only? ———————
(b) curves only? ———————
(c) straight lines and curves? ———————
Solution:
(a) 4, 7
(b) 3, 8
(c) 2, 5
2.
There are ———- straight lines and ———- curves in the above picture.
Solution:
There are 8 straight lines and 4 curves in the above picture.
3.
There are ———- straight lines and ———- curves in the above picture.
Solution:
There are 5 straight lines and 2 curves in the above picture.
4.
There are ———- straight lines and ———- curves in the above picture.
Solution:
There are 6 straight lines and 1 curve in the above picture.
5.
There are ———- straight lines and ———- curves in the above picture.
Solution:
There are 6 straight lines and 2 curves in the above picture.
6.
There are ———- straight lines and ———- curves in the above picture.
Solution:
There are 4 straight lines and 1 curve in the above picture.
7.
The candle has ———– flat surface(s).
Solution:
The candle has 1 flat surface.
8.
The box of tissues has ———– flat surface(s).
Solution:
The box of tissues has 6 flat surfaces.
9.
The box of ice cream has ———– flat surface(s).
Solution:
The box of ice cream has 6 flat surfaces.
10.
The pot of flowers has ———– flat surface(s).
Solution:
The pot of flowers has 1 flat surface.
11.
The container has ———– flat surface(s).
Solution:
The container has 2 flat surfaces.
For each object, count the number of flat surfaces and write the correct answer on the lines below.
Solution(12-15):
12. 6
13. 5
14. 0
15. 5
