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Solving Math for 3rd grade, pages 109 and 110 of Cánh Diều workbook volume 2
Solving exercises on pages 109 and 110 of Math Grade 3 Workbook Volume 2, Cánh Diều:
Geometry and Measurement Review
1. Solve Exercise 1 Page 109 Math Grade 3 Textbook
Problem: State the midpoints of line segments BC, CD, and DE:
Solution Guide: Observe the diagram then identify the midpoint of each line segment.
Answer:
Point Q is the midpoint of line segment BC (because Q is between points B and C; BQ = CQ).
Point N is the midpoint of line segment CD (because N is between points C and D; CN = DN).
2. Solve Exercise 2 Page 109 Math Grade 3 Textbook
Problem: Given the following shapes:
a) State the name of the shapes and the vertices, edges, and angles in each shape.
b) Use a protractor to check how many right angles are in each shape.
Solution Guide: Observe the diagram then state the names of the shapes, vertices, edges, and angles of each shape.
Guide: Observe the drawing then name the shapes, vertices, edges, and angles of each shape.
Answer:
- Triangle MNP:
+ 3 vertices: M, N, P
+ 3 edges: MN, NP, PM
+ 3 angles: Angle at vertex M, edge MN, MP
Angle at vertex N, edge NM, NP
Angle at vertex P, edge PN, PM
- Quadrilateral ABCD:
+ 4 vertices: A, B, C, D
+ 4 edges: AB, BC, CD, DA
+ 4 angles: Angle at vertex A, edges AD and AB
Angle at vertex B, edges BC and BA
Angle at vertex C, edges CD and CB
Angle at vertex D, edges DA and DC
- Quadrilateral GHIK:
+ 4 vertices: G, H, I, K
+ 4 edges: GH, HI, IK, KG
+ 4 angles: Angle at vertex G, edges GH and GK
Angle at vertex H, edges HG and HI
Angle at vertex I, edges IH and IK
Angle at vertex K, edges KI and KG
3. Solve Exercise 3 Page 109 Math Grade 3 Textbook
Problem: Choose the letter before the correct answer.
The radii of the circles on the sides are:
A. OC, AB. B. OA, OC, AB.
C. OA, OB, OC. D. OA, OB, AB.
Guidance: Observe the diagram, determine the radii of the circles, and draw conclusions.
Answer:
The circle above has center O, and the radii are OA, OB, OC.
We choose option C as the answer.
- See more: Solving exercises from page 111, 112 of Math 3 Workbook Volume 2, Cánh Diều book
4. Solve Exercise 4 Page 109 Math Grade 3 Textbook
Problem: What time does each clock indicate?
Solution Guide: Observe the illustration and choose the appropriate method for reading the time on each clock.
Answer:
5. Solve Exercise 5 Page 110 Math Grade 3 Textbook
Problem: Circle the letter before the correct answer.
Solution Guide: Observe the illustration, and based on the characteristics of the cube and rectangular prism, select the correct answer.
Answer:
6. Solve Exercise 6 Page 110 Math Grade 3 Textbook
Problem: How many meters of fencing are needed to surround a rectangular yard with the dimensions as shown below?
Ask how many meters of fencing are needed? Given that the gate section is 3 meters wide.
Solution Guide: To calculate the number of meters of fencing needed, subtract the gate section from the perimeter of the rectangular yard.
Answer:
The perimeter of the yard is:
(100 + 50) x 2 = 300 (m)
People need to fence in meters:
300 - 3 = 297 (m)
Answer: 297 m.
7. Solution for Exercise 7 Page 110 Math Grade 3 Textbook
Problem: Minh Ánh starts practicing the piano at 9:00, which is 10 minutes late, and practices for 45 minutes. Ask what time Minh Ánh finishes practicing?
Solution Guide: Based on the time Minh Ánh starts practicing the piano and the duration of practice, find the time Minh Ánh finishes practicing.
Answer:
From 9:00 minus 10 minutes to 9:35 is 45 minutes.
Therefore, Minh Ánh finishes practicing at 9:35.
Solving exercises from page 109, 110 of Math 3 Workbook Volume 2, Cánh Diều book provides detailed step-by-step solutions for each exercise, hoping that students can grasp the knowledge and practice effectively.
