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Solve Math Grade 3 exercises on page 65 Workbook Volume 2 SGK
Solving exercises on page 65 of Mathematics Grade 3 Workbook Volume 2, book Connecting Knowledge with Life:
Rounding to Thousands, Tens of Thousands
Activity
Solve Exercise 1 Page 65 Mathematics Grade 3 Workbook
Problem: a) Round the numbers 65,341, 10,501, 9,805 to the nearest thousand. b) Round the numbers 82,134, 55,712, 46,000 to the nearest ten thousand.
Solution Guide: When rounding to the nearest thousand, compare the hundreds digit with 5. If the hundreds digit is less than 5, round down; otherwise, round up. When rounding to the nearest ten thousand, compare the thousands digit with 5. If the thousands digit is less than 5, round down; otherwise, round up.
Answers:
a) Rounding to Thousands
b) Rounding to Ten Thousands
2. Solve Exercise 2 Page 65 Mathematics Grade 3 Workbook
Problem: A family harvested 13,787 kg of coffee beans. If rounding the number to the nearest thousand, approximately how many kilograms of coffee did the family harvest?
Solution Guide: When rounding to the nearest thousand, compare the hundreds digit with 5. If the hundreds digit is less than 5, round down; otherwise, round up.
Answers:
So if rounding to the nearest thousand, we can say the family harvested approximately 14,000 kg of coffee.
Practice
1. Solve Exercise 1 Page 65 Mathematics Grade 3 Workbook
Problem: Choose the correct answer. The population of a district is 71,839. In the newspaper, the reporter rounded the population of that district to the nearest ten thousand. What is the rounded population to the nearest ten thousand? A. 80,000 B. 75,000 C. 70,000 D. 72,000
Solution Guide: When rounding to the nearest ten thousand, compare the thousands digit with 5. If the thousands digit is less than 5, round down; otherwise, round up.
Answers: The number 71,839 has a thousands digit of 1. Since 1 is less than 5, we round down. Therefore, rounding the number 71,839 to the nearest ten thousand gives us 70,000. So the rounded population to the nearest ten thousand is 70,000.
2. Solve Exercise 2 Page 65 Mathematics Grade 3 Workbook
a) At an altitude of 35,786 km, which digit did each person round to which place value?
b) When rounding the altitude of a satellite flying at 35,425 km to the nearest thousand, ten thousand, what are the resulting digits?
a) Observing the diagram:
- The first person rounded to the nearest ten thousand, getting approximately 40,000 km.
- The second person rounded to the nearest hundred, resulting in approximately 35,800 km.
- The third person rounded to the nearest thousand, yielding approximately 36,000 km.
b) For a satellite flying at 35,425 km:
- When rounding to the nearest thousand, we get 35,000 km.
- When rounding to the nearest ten thousand, we get 40,000 km.
I hope all of you have successfully solved the exercises and mastered the methods when referring to the solution materials on page 65 of Math 3 Textbook Volume 2, the book Connecting Knowledge with Life.
