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Solving Grade 4 math problems on pages 113, 114, 115 in Workbook 2, Exercise Focus, Lesson 173 provides the most detailed solutions for exercises 1, 2, 3, 4, and 5, closely aligned with the learning content, helping students reinforce their knowledge and easily grasp the solution methods, fostering a love for Math and achieving the best scores.
Solve Grade 4 math problems on pages 113, 114, 115 in Workbook 2, Exercise Focus, Lesson 173
1. Solve Exercise 1 - Math workbook for Grade 4 Book 2 page 113
Problem statement:
Fill in the blanks with appropriate numbers (according to the model)
Solution method:
To determine the value of digits, we need to identify their places. The digits of a number, from right to left, are units, tens, hundreds, thousands, ten thousands, ...
Answer
2. Solve Exercise 2 - Math workbook for Grade 4 Book 2 page 114
Problem statement:
Set up and then calculate
a) Addition: 52749 + 38426
b) Subtraction: 94802 - 45316
c) Multiplication: 417 x 352
d) Division: 95150 ÷ 275
Solution method
- To add or subtract two natural numbers, align the digits vertically and calculate from right to left.
- To multiply two natural numbers, align the digits vertically and calculate from right to left.
- To divide two natural numbers, align the digits vertically and divide from left to right.
Answer
3. Solve Exercise 3 - Math workbook for Grade 4 Book 2 page 114
Problem statement:
Fill in the blanks with appropriate signs:
Solution method
To compare two fractions with different denominators, we need to make their denominators the same and then compare the fractions after making them the same.
Answer
4. Solve Exercise 4 - Math workbook for Grade 4 Book 2 page 114
Problem statement:
A rectangular field has a length of 200m and a width equal to 3/5 of the length. Rice is grown there, and it is found that harvesting 100m² yields 55kg of rice. How many kilograms of rice have been harvested in the field?
Solution method:
- Calculate the width = length x 2/3
- Calculate the area by multiplying length and width.
- Amount of rice harvested = area : 100 x 55kg
- Convert the result to the measurement unit of 'tạ', note that 1 'tạ' = 100kg
Answer
The width of the rectangle is:
200 : 5 x 3 = 120 (m)
The area of the plot of land is:
120 x 200 = 24000 (m2)
The amount of rice harvested in that plot of land is:
24000 x 55 : 100 = 13200 (kg)
13200kg = 132 'tạ'
Answer: 132 'tạ'
5. Solve problem 5 - Mathematics workbook for grade 4 exercise 2 page 115
Problem:
Find the numerical values of a and b, given:
Solution method
Base on the given calculation, deduce to find the appropriate digits.
Answer
a) Units place: 0+b=8 so b=8
Tens place: 8+a=12 so a=4 (carry 1).
Hundreds place: 4 carry 1 equals 5 (correct)
So a=4;b=8.
b) b is not 0, because if b=0 then 0 minus 0 equals 0 (different from 8).
Therefore, we must take 10−b=8, so b=2, carry 1 to a.
We have 12 minus a+1 equals 7 so a+1=12−7, or a+1=5 which means a=4.
(As 2 cannot subtract (a+1) to get the difference as 7).
Therefore a=4;b=2
You are viewing the guide to Solve grade 4 math problems on pages 113, 114, 115 of Workbook 2 Concentrated Practice Exercises 173, you can review the guide to Solve grade 4 math problems on pages 111, 112, 113 of Workbook 2 Concentrated Practice or preview the guide to Solve grade 4 math problems on pages 115, 116, 117 of Workbook 2 Concentrated Practice to better understand the lesson.
