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Guidance on solving exercises on page 73 of Grade 4 Math (continued) including solving methods
1. Solving Exercise 1 on Page 73 of Grade 4 Math Textbook (continued)
Problem Statement:
Set up and solve:
a) 523 x 305; b) 308 x 563; c) 1309 x 202
Solution Method:
Refer back to the detailed instructions on setting up calculations in Exercise 1 on Page 69 of Grade 4 Math Textbook.
Answer:
2. Solving Exercise 2 on Page 73 of Grade 4 Math Textbook (continued)
Solution Method:
- Perform multiplication as usual, review the multiplication setup method in previous exercise-solving instructions.
- Double-check the calculations in the given questions, then conclude whether the calculation is correct or incorrect.
Answer:
We have the second product consisting entirely of the digit 0 (since 456 x 0 = 0), so we typically abbreviate this product as in case c (product 912 shifted two columns to the left compared to the first product).
So: Box 1 writes S ; Box 2 writes S ; Box 3 writes D.
3. Solving Exercise 3 on Page 73 of Grade 4 Math Textbook (continued)
Problem Statement:
On average, each laying hen consumes 104 grams of food in a day. How many kilograms of food does a poultry farm need for 375 laying hens over 10 days?
Solution Method:
- Given: Each laying hen consumes 104 grams of food per day
- Required: Calculate the kilograms of food needed for the farm to provide for 375 laying hens over 10 days
- Method:
+ Calculate the amount of food the farm needs to provide for 375 laying hens in one day, by multiplying the amount of food one laying hen consumes by 375
+ Convert grams to kilograms
+ Calculate the kilograms of food the farm needs to provide for 375 laying hens over 10 days, by multiplying the amount of food the farm needs in one day by 10.
Answer:
The amount of food the farm needs per day is:
104 x 375 = 39000 (g)
39000 g = 39 kg
The amount of food the farm needs over 10 days is:
39 x 10 = 390 (kg)
The answer is 390 kg
Apart from the lesson above, students should also refer to the content of Solving Math 4 page 29 regarding charts to better understand concepts such as chart creation and interpreting information from charts for future applications.
Here is the solution section for Exercise 73 in Grade 4 Math Textbook (continued) in the section of solving math exercises for Grade 4. Students can review the previously solved Exercise 73 in Grade 4 Math Textbook or preview Exercise 74 in Grade 4 Math Textbook to enhance their understanding of Grade 4 Math.
