Solve Exercise 1 on Pages 78 and 79 of Math 4 Textbook

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Ngày cập nhật gần nhất: 15/4/2026

Solve Exercise 1 on Pages 78 and 79 of Math 4: Dividing a number by a product. Calculating the expression:

Step-by-step guide to solve Exercise 1 on Pages 78 and 79 of Math 4 Textbook

Problem statement:
Calculate the value of the expression:
a) 50 : (2 x 5); b) 72 : (9 x 8); c) 28 : (7 x 2).

Solution Method:
- Method 1: Execute the calculation inside the parentheses first, then outside the parentheses.
- Method 2: Unwrap the expression a : (b x c) into the form a : b : c, then perform the calculation from left to right.

Answer:
a) 50 : (2 x 5) = 50 : 10 = 5

50 : (2 x 5) = 50 : 2 : 5 = 25 : 5 = 5

50 : (2 x 5) = 50 : 5 : 2 = 10 : 2 = 5

b) 72 : (9 x 8) = 72 : 72 = 1

72 : (9 x 8) = 72 : 9 : 8 = 8 :8 = 1

72 : (9 x 8) = 72 : 8 : 9 = 9 : 9 = 1

c) 28 : (7 x 2)= 28 : 14 = 2

28 : (7 x 2) = 28 : 7 : 2 = 4 : 2 = 2

28 : (7 x 2) = 28 : 2 : 7 = 14 : 7 = 2.

Mytour has just provided guidance on solving Exercise 1 on pages 78 and 79 of Math 4 textbook. Additionally, we suggest solving Exercise 2 on Pages 78 and 79 of Math 4 and Exercise 3 on Pages 78 and 79 of Math 4 with detailed methods. Let's explore the guide to solve exercises on Pages 78 and 79 of Math 4 to excel in 4th-grade math!

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