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Solving Math Grade 3 exercises on pages 119 and 120 in Cánh Diều Volume 1
Solving exercises on pages 119 and 120 in Math 3 Volume 1, Cánh Diều book:
Geometry and Measurement Review
1. Solve Exercise 1 on Page 119 of Math Grade 3 Textbook
Problem: Use a set square to check and then name the right angles, non-right angles in the following figures:
Solution: Use a set square to check and then name the right angles and non-right angles.
Answer:
- Right angle at vertex N, sides NM and NP
- Right angle at vertex I, sides IH and IK
- Non-right angle at vertex O, sides OA and OB
- Non-right angle at vertex Y, sides YX and YZ
2. Solve Exercise 2 on Page 119 of Math Grade 3 Textbook
Problem: Measure the lengths of the sides and then calculate the perimeter of each figure below:
Solution:
- Perimeter of rectangle = (length + width) x 2.
- Perimeter of triangle equals the sum of the lengths of its 3 sides.
Answer:
+) Rectangle ABCD with BC = AD = 6cm, AB = CD = 3cm.
The perimeter of rectangle ABCD is: (6 + 3) x 2 = 18 (cm)
+) Triangle LMN with LM = 3cm, MN = 4cm, NL = 5cm.
The perimeter of triangle LMN = 3 + 4 + 5 = 12 (cm).
3. Solve Exercise 3 on Page 119 of Math Grade 3 Textbook
Problem: An elephant pours honey, distilled water, and cooking oil successively into a measuring jar as shown in the figure below:
a) How many milliliters of honey are there?
b) How many milliliters of cooking oil are there?
c) How many milliliters in total are there in the measuring jar, including honey, distilled water, and cooking oil?
Solution:
- Observe the markings on the glass then determine the number of milliliters of honey, cooking oil.
- Calculate the total number of milliliters including honey, distilled water, and cooking oil
Answer:
We see that each small marking on the glass corresponds to 10 ml.
a) There are 200 milliliters of honey.
b) There are 90 milliliters of cooking oil.
c) The measuring jar contains a total of 440 milliliters including honey, distilled water, and cooking oil.
- See more: Solve Exercise 121, 122 in Math 3 Textbook Wings
4. Solve Exercise 4 on Page 120 SGK Math Grade 3
Problem: a) Which of the following tools is used to determine weight?
b) What is each remaining tool used to measure?
Solution Method: Observe the drawing and identify the tools for measuring weight and other quantities.
Answer:
We label the tools as shown in the image below:
a) Tools in figures 1, 4, 6, 7 are used for determining weight.
b) The tool in figure 2 is used for determining right angles.
The tool in figure 3 is used for determining volume.
The tool in figure 5 is used for measuring time.
5. Solve Exercise 5 on Page 120 SGK Math Grade 3
Problem: Draw line segment AB with a length of 4 cm. Draw line segment CD with a length twice that of line segment AB. Draw line segment MN with a length equal to half of line segment AB.
Solution:
- Step 1: Calculate the length of line segment CD = Length of line segment AB x 2. Calculate the length of line segment MN = Length of line segment AB ÷ 2.
- Step 2: Draw line segments AB, CD, MN.
Answer:
The length of line segment CD is 4 x 2 = 8 (cm)
The length of line segment MN is 4 ÷ 2 = 2 (cm)
Draw line segments CD, MN:
6. Solve Exercise 6 on Page 120 SGK Math Grade 3
Problem: There are 120g of dried shiitake mushrooms. After soaking in water, the weight of those mushrooms is 407g. How much does the weight of those mushrooms increase after soaking in water?
Solution:
To find the additional weight of shiitake mushrooms after soaking in water, subtract the weight of dried mushrooms from the weight of soaked mushrooms.
Answer:
After soaking in water, the additional weight of those mushrooms is:
407 - 120 = 287 grams
Answer: 287 grams
This is the solution for exercises on pages 119 and 120 in Math Grade 3 Workbook 1, Kite Book. We hope students have mastered geometry and measurement knowledge as well as completed exercises in the textbook pages 119, 120.
