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Solving 3rd-grade Math, pages 51 and 52, 'Horizon of Creativity' series
Solving exercises on pages 51 and 52 in Math 3 Workbook Volume 1, the book 'Horizon of Creativity'
Multiplying by a single-digit number within the range of 1000 (continued)
Practical Section
1. Solve exercise 1 on page 51 of Math 3 Workbook
Problem: Set up the calculation and solve.
a) 43 x 4 b) 241 x 4
14 x 4 101 x 5
Solution Approach:
- Step 1: Arrange the digits so that they align vertically in columns.
- Step 2: Perform multiplication from right to left.
Answer:
Practice
1. Solve exercise 1 on page 52 of Math 3 Workbook
Problem: What's the number?
Solution Guide: To find the number of mangoes in the baskets, multiply the number of mangoes in each basket by the number of baskets.
Answer:
2. Solve exercise 2 on page 52 of Math 3 Workbook
Problem: What is each number's value in the expressions?
Solution Guide:
- Step 1: Calculate the value of each expression.
- Step 2: Choose the appropriate result for each expression.
Answer:
We have:
A. 120 x 2 = 240
B. 125 x 2 = 250
C. 60 x 2 x 3 = 120 x 3 = 360
- Read more: Solve exercises on pages 53, 54 in Math 3 Workbook, Creative Horizon series
Task 3: Solve exercise 3 on page 52 of Math 3 Workbook
Problem: Calculate to determine what each person will do.
Solution Guide:
- Step 1: Calculate the values of the expressions.
- Step 2: Find the corresponding result for each expression to determine what each person will do.
Answer:
Tú: 113 x 5 - 562 = 565 - 562 = 3
Tân: 2 : ( 99 - 97 ) = 2 : 2 = 1
Sơn: 82 - 27 - 53 = 55 - 53 = 2
Nam: 82 - 27 x 3 = 82 - 81 = 1
Assistance and Responsibilities: Nam and Tân are assisting you, Tú is engaged in environmental hygiene, and Sơn is involved in tree planting.
Challenge
Solution Guide:
- Step 1: Calculate the number of pens in 5 boxes (enough).
- Step 2: Calculate the number of pens in 5 boxes when 3 pens are missing.
- Step 3: Choose the appropriate expression.
Answer:
The number of pens in 5 boxes (enough) is:
12 x 5 = 60 (pens)
Since 4 boxes are enough and 1 box is missing three pens, the number of pens in 5 boxes is:
60 - 3 = 57 (pens)
So, the expression to calculate the number of pens in 5 boxes is C. 12 x 5 - 3.
Solving exercises on pages 51 and 52 in Math 3 Workbook Volume 1, 'Horizon of Creativity,' has been meticulously guided by Mytour. Students can refer to it to easily and accurately solve exercises of Multiplying by a single-digit number within the range of 1000 (continued), hoping to gain useful knowledge and make math easy.
