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Solve Fourth-Grade Math on Pages 95, 96 in VBT's Second Exercise Book, reviewing fraction operations in Exercise 161. This guide provides detailed solutions and answers for exercises 1, 2, 3, and 4, helping students easily grasp fraction operations and reinforce their knowledge.
Solve Fourth-Grade Math on Pages 95, 96 in VBT's Second Exercise Book, reviewing fraction operations in Exercise 161.
1. Solve Exercise 1 - Math Workbook for Fourth Grade, Volume 2, Page 95
Problem Statement:
Calculate:
Solution Approach:
- To multiply two fractions, multiply the numerator by the numerator and the denominator by the denominator.
- To divide two fractions, multiply the first fraction by the reciprocal of the second fraction.
Answer
2. Solve Exercise 2 - Math Workbook for Fourth Grade, Volume 2, Page 95
Problem Statement:
Find x:
Solution Approach
Apply the following rules:
- To find the unknown factor, divide the product by the known factor.
- To find the divisor, multiply the quotient by the divisor.
Answer
3. Solve Exercise 3 - Math Workbook for Fourth Grade, Volume 2, Page 95
Problem Statement:
Calculate:
Solution Approach
- To multiply two fractions, multiply the numerator by the numerator and the denominator by the denominator.
- Break down the numerator and denominator into the product of their prime factors, then cancel out common factors from both the numerator and denominator.
Answer
4. Solve Exercise 4 - Math workbook for fourth grade, volume 2, page 96
Problem:
A square sheet of paper has a side length of 2/5 meters.
a) Calculate the perimeter and area of that square sheet of paper.
b) An cuts the square sheet of paper into square cells, each with a side length of 2/25 meters. How many square cells can An cut in total?
c) A rectangular sheet of paper with the same area as the square sheet and a length of 4/5 meters. Find the width of the rectangle.
Solution Approach
Apply the following formulas:
- Perimeter of the square = side x 4.
- Area of the square = side x side.
- Number of square cells cut = area of the sheet : area of one square cell.
- Width of the rectangle = area of the rectangle : length.
Answer
a) The perimeter of the square is:
2/5 x 4 = 8/5 (m)
- Area of the square = side x side.
2/5 x 2/5 = 4/25 (m2)
b) Area of each square cell is:
2/25 x 2/25 = 4/625 (m2)
Number of small square cells is:
4/25 : 4/625 = 25 (cells)
c) The width of the rectangle is:
4/25 : 4/5 = 1/5 (m)
You are currently viewing the guide for solving fourth-grade math on pages 95 and 96 in VBT's second exercise book, reviewing operations with fractions (continued) exercise 161. You can revisit the instructions for solving fourth-grade math on pages 94, 95 in VBT's second exercise book, reviewing operations with fractions, or preview the guidance for solving fourth-grade math on page 97 in VBT's second exercise book, reviewing operations with fractions (continued) to gain a deeper understanding of the lesson.
