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Solving Math exercises on pages 85 and 86 of Workbook 1, Connecting Knowledge with Life book for grade 3
Solving exercises on pages 85 and 86 of Math 3 Grade 1 Textbook, Connecting Knowledge with Life series:
Millimeters
Activity
1. Solving Exercise 1 on Page 85 of Math Workbook for Grade 3
The problem: Number?
Solution steps:
- Step 1: Observe the drawing and determine the length of each line segment in centimeters.
- Step 2: Apply the conversion: 1cm = 10mm.
The answer:
We have:
AB = 2 cm = 20 mm.
CD = 3 cm = 30 mm.
We fill in as follows:
2. Solving Exercise 2 on Page 85 of Math Workbook for Grade 3
The problem: Number?
Solution steps:
Apply the conversion:
1cm = 10 mm.
1m = 1000 mm.
The answer:
3. Solving Exercise 3 on Page 86 of Math Workbook for Grade 3
The problem: Who is longer?
Solution steps:
Step 1: Convert 3 cm to mm using the conversion 1 cm = 10 mm.
Step 2: Compare the lengths of the ant and the snail and then conclude.
The answer:
We have 3 cm = 30 mm.
Since 30 mm > 3 mm.
Therefore, the snail is longer than the ant.
Practice
1. Solving Exercise 1 on Page 86 of Math Workbook for Grade 3
The problem: Calculate.
Solution steps: Perform calculations and write the unit of measurement after the result.
The answer:
250 mm + 100 mm = 350 mm.
420 mm - 150 mm = 270 mm.
25 mm + 3 mm = 28 mm.
64 mm - 15 mm = 49 mm.
11 mm x 3 = 33 mm.
50 mm : 2 = 25 mm.
2. Solving Exercise 2 on Page 86 of Math Workbook for Grade 3
The problem: Number?
Solution steps:
- To multiply a number by another number, multiply the number by the number of times.
- To decrease a number by a certain number of times, divide the number by the number of parts.
The answer:
3. Solving Exercise 3 on Page 86 of Math Workbook for Grade 3
The problem: A snail travels from home to school. It has traveled 152 mm so far. The remaining distance to school is 264 mm. How long is the total distance from home to school in millimeters?
Solution steps: Total distance from home to school = Distance traveled so far + Remaining distance
The answer:
The total distance the snail travels from home to school is:
152 + 264 = 416 (mm)
Answer: 416 mm.
4. Solving Exercise 4 on Page 86 of Math Workbook for Grade 3
The problem: Grasshopper practices jumping every day. On the first day, it jumps 12 mm. A week later, it jumps three times the distance of the first day. How far does the grasshopper jump in millimeters at that time?
Solution steps: The number of millimeters the grasshopper jumps after a week = Millimeters jumped on the first day x 3.
The answer:
A week later, the grasshopper jumps a distance of millimeters:
12 x 3 = 36 (mm)
Answer: 36 mm.
Solving exercises on pages 85 and 86 of Math Workbook for Grade 3, Connecting Knowledge with Life, is a valuable resource. It not only helps students solve exercises 1, 2... easily but also effectively reinforces the lesson on Millimeters.
