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Guide to solving exercises on page 76 of Math for 4th grade, including solving methods
1. Solving exercise 1 on page 76 Math textbook for 4th grade
Exercise:
a) Solve in two ways:
(15 + 35) : 5;
(80 + 4) : 4
b) Solve in two ways (as per pattern)
Pattern: 12 : 4 + 20 : 4 = ?
Method 1: 12 : 4 + 20 : 4 = 3 + 5 = 8.
Method 2: 12 : 4 + 20 : 4 = (12 + 20) : 4 = 32 : 4 = 8.
18 : 6 + 24 : 6;
60 : 3 + 9 : 3.
Solution method:
- For part a):
+ Method 1: Students perform calculations within parentheses first, then outside parentheses
+ Method 2: Apply the formula: (a + b) : c = a : c + b : c => Perform division first, then addition
a)
Exercise:
Solve in two ways (as per pattern):
a) (27 - 18) : 3; b) (64 - 32) : 8
Pattern: (35 - 21): 7 = ?
Method 1: (35 - 21) : 7 = 14 : 7 = 2
Method 2: (35 - 21) : 7 = 35 : 7 - 21 : 7 = 5 - 3 = 2
Solution method:
- Method 1: Perform calculations within parentheses first, outside parentheses second
- Method 2: Apply the method: (a - b) : c = a : c - b : c
Answer:
a) (27 - 18) : 3 =?
Method 1: (27 - 18) : 3 = 9 : 3 = 3
Method 2: (27 - 18) : 3 = 27 : 3 - 18 : 3 = 9 - 6 = 3
b) (64 - 32) : 8 = ?
Method 1: (64 - 32) : 8 = 32 : 8 = 4
Method 2: (64 - 32) : 8 = 64 : 8 - 32 : 8 = 8 - 4 = 4
Exercise:
Class 4A has 32 students divided into groups, each group has 4 students. Class 4B also has 28 students divided into groups, each group has 4 students. How many groups are there in total?
Solution method:
You can solve this problem in 2 ways:
- Method 1:
+ Step 1: Calculate the number of student groups in class 4A, by dividing the total number of students in class 4A by the number of students per group.
+ Step 2: Similarly, calculate the number of student groups in class 4B, by dividing the total number of students in class 4B by the number of students per group.
+ Step 3: Calculate the total number of student groups of both classes 4A and 4B, by adding the results from step 1 and step 2.
- Method 2:
+ Calculate the total number of students in both classes, by adding the number of students in class 4A and class 4B.
+ Calculate the number of student groups in both classes, by dividing the total number of students in both classes by the number of students per group.
Answer:
Method 1:
The number of student groups in class 4A is:
32 : 4 = 8 (groups)
The number of student groups in class 4B is:
28 : 4 = 7 (groups)
The number of student groups in both classes 4A and 4B is:
8 + 7 = 15 (groups)
Method 2:
The total number of students in both classes is:
32 + 28 = 60 (students)
The number of student groups in both classes 4A and 4B is:
60 : 4 = 15 (groups)
Answer: 15 groups.
Guide to solving exercises on page 76 Math 4 succinctly
Here is the solution to exercises on page 76 of Math textbook for 4th grade in the section of solving 4th-grade math exercises. Students can review the solution to exercises on page 75 of Math textbook for 4th grade that has been solved previously or preview the solution to exercises on page 78 of Math textbook for 4th grade to study Math for 4th grade better
To study the next Concentrated Practice better, students will need to practice various types of exercises such as Solving Math 4 on pages 36, 37, Next Concentrated Practice as well as Solving Math 4 on pages 33, 34, Chart Practice according to the Concentrated Practice Math textbook.
