Solve Exercise 2 Page 78 Math 4 Workbook

Solution guide for Exercise 2 on Page 78 Math 4 Workbook

Problem:
Find two numbers knowing their sum and difference:
a) 42506 and 18472                                b) 137895 and 85287

Solution Method:
Method for solving the problem of finding two numbers when knowing their sum and difference:
- Find the smaller number by adding the sum and difference, then divide the result by 2.
- Find the larger number by subtracting the difference from the sum, then divide the result by 2.

Answer:
a) The smaller number is:                                                           b) The smaller number is:
  (42,506 - 18,472) / 2 = 12,017                                  (137,895 - 85,287) / 2 = 26,304
   The larger number is:                                                                   The larger number is:
   12,017 + 18,472 = 30,489                                           26,304 + 85,287 = 111,591
Answer: Smaller number: 12,017.                                                                                 Answer: Smaller number: 26,304;
Larger number : 30,489.                                                                       The larger number: 111,591.

Here is the solution guide for exercise 2 on page 78 of Math 4 textbook. In addition, this section also includes 3 other exercises: Solve Exercise 1 on page 78 of Math 4, Solve Exercise 3 on page 78 of Math 4, and Solve Exercise 4 on page 78 of Math 4. Let's check the solution to exercise 78 in Math 4 to excel in 4th-grade math!