Solve Exercise 3 Page 62 Math 5 Textbook

Guidance on solving exercise 3 on page 62 Math 5 textbook

Problem:
a) Optimize for convenience:
0.12 x 400;
4.7 x 5.5 − 4.7 x 4.5.
b) Mentally calculate to find x:
5.4 x x = 5.4
9.8 x x = 6.2 x 9.8

Solution Method:
For part a):
- Calculation 1: Convert to decimal by multiplying with 100, then perform normal calculation.
- Calculation 2: Apply the formula: (a - b) x c = a x c - b x c
For part b):
- Rule of multiplying a number by 1: a x 1 = a (Any number multiplied by 1 equals the number itself)
- Commutative property of multiplication: a x b = b x a. 

Answer:

a)
0.12 x 400 = 0.12 x 100 x 4 = 12 x 4 = 48
4.7 x 5.5 − 4.7 x 4.5 = 4.7 x (5.5 − 4.5) = 4.7 x 1 = 4.7
b) 
- We have: 5.4 x x = 5.4 => x = 1
- We have: 9.8 x x = 6.2 x 9.8 => x = 6.2.

Section solving exercises page 62 Math 5, Concentrated practice consists of 4 exercises, Next part solving exercises 3 page 62 Textbook Math 5. Mytour has suggested answers and detailed solution methods for Solving Exercise 1 Page 62 Math 5, Solving Exercise 2 Page 62 Math 5 and Solving Exercise 3 Page 62 Math 5, students need to grasp the knowledge of this lesson.