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Usually for students, division is perhaps more complex than addition, subtraction, and multiplication. In the Grade 4 Math curriculum, we have learned about dividing by single-digit numbers. In this Exercise 4 on page 81, students get familiar with dividing by two-digit numbers. Dividing by a single digit is already challenging, and dividing by two or three digits is even more complicated. However, if you grasp some tricks when performing calculations, students will certainly solve math problems successfully. In the solution guide for Exercise 4 on page 81, besides providing hints for students on how to divide step by step and the accurate answers to the calculations, we will also guide students to estimate the quotient by rounding the dividend and divisor, then mentally calculate the quotient, or roughly estimate by taking one or two leading digits of the dividend divided by the leading digit of the divisor to try the quotient result.
1. Solve Exercise 1 Page 81 Math 4 Textbook
Problem Statement:
Solve and calculate.
a) 288 : 24 b) 469 : 67
740 : 45 397 : 56
Solution Method:
Rule for dividing numbers with multiple digits by two-digit numbers:
- Arrange the calculation in vertical columns
- Take the first two digits of the dividend, if they are smaller than the divisor, take the first three digits of the dividend, divide by the divisor, obtain the quotient, and multiply it by the divisor
- Subtract the product obtained from the dividend
Answer:
2. Solve Exercise 2 Page 81 Math 4 Textbook
Problem Statement:
240 sets of desks and chairs are evenly arranged into 15 classrooms. How many sets of desks and chairs are arranged in each classroom?
Solution Method:
- Given: 240 sets of desks and chairs arranged into 15 classrooms
- Required: Calculate the number of sets of desks and chairs arranged in each classroom
- Solution Approach: To find out how many sets of desks and chairs are arranged in each classroom, divide the total number of sets of desks and chairs by 15.
Answer:
The number of sets of desks and chairs arranged in each classroom is:
240 : 15 = 16 (sets)
Answer: 16 sets
Problem Statement:
Find x:
a) x x 34 = 714 b) 846 : x = 18
Solution Method:
- For part a) To find the unknown factor (hidden x), we divide the product by the known factor.
- For part b) To find the divisor (hidden x), we divide the dividend by the quotient.
Answer:
a) x x 34 = 714 b) 846 : x = 18
=> x = 714 : 34 => x = 846 : 18
=> x = 21 => x = 47
Concise Guide to Solve Exercise 81 Math 4
Above is the solution to Exercise 81 of Math 4 textbook in the section of solving math exercises for Grade 4. Students can review the solution to Exercise 80 of Math 4 textbook previously solved or preview the solution to Exercise 82 of Math 4 textbook (next) to enhance their Grade 4 Math skills further
In the Grade 4 Math curriculum, solving Exercise 58 of Math 4 textbook is one of the crucial topics that students need to pay attention to and improve in order to enhance their Grade 4 Math solving skills.
In addition to the above content, students can explore the solution to Exercise 65 of Math 4 textbook to enhance their Grade 4 Math knowledge further.
