Solving exercises on page 37 of Math 3 Volume 1 textbook, the book Horizon of Innovation

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Solving Grade 3 Math page 37 Horizon of Innovation book
 

Solving exercises on page 37 Math 3 Volume 1 textbook, the book Horizon of Innovation:

Rounding Numbers

Practical Section

1. Solve Exercise 1 Page 37 Math Grade 3

Task: Round numbers to the nearest ten.
a, Round the numbers 41, 42, 43, 44 to the nearest ten. What do you get?
b, Round the numbers 75, 76, 77, 78, 79 to the nearest ten. What do you get?

Solution:
Method for rounding numbers to the nearest ten:
- If the ones digit is 1, 2, 3, or 4, keep the tens digit unchanged.
- If the ones digit is 5, 6, 7, 8, or 9, add 1 to the tens digit.
- After rounding, the ones digit becomes 0.

Answer:
a, Round the numbers 41, 42, 43, 44 to the nearest ten, and you get 40.
b, Round the numbers 75, 76, 77, 78, 79 to the nearest ten, and you get 80.

2. Solve Exercise 2 Page 37 Math Grade 3

Task: Round numbers to the nearest hundred.
a, Round the numbers 814, 826, 835, 847 to the nearest hundred. What do you get?
b, Round the numbers 152, 168, 170, 189, 191 to the nearest hundred. What do you get?

Solution:
Method for rounding numbers to the nearest hundred:
- If the tens digit is 1, 2, 3, or 4, keep the hundreds digit unchanged.
- If the tens digit is 5, 6, 7, 8, or 9, add 1 to the hundreds digit.
- After rounding, the tens and ones digits become 0.

Answer:
a, Round the numbers 814, 826, 835, 847 to the nearest hundred, and you get 800.
b, Round the numbers 152, 168, 170, 189, 191 to the nearest hundred, and you get 200.

Practice Section

Exercise 1 on Page 37 Math Grade 3

Problem: Round the numbers.
a, Round the number 53 to the nearest ten. What do you get?
b, Round the number 95 to the nearest ten. What do you get?
c, Round the number 620 to the nearest hundred. What do you get?
d, Round the number 974 to the nearest hundred. What do you get?

Solution:

How to round numbers to the nearest ten:
- If the ones digit is 1, 2, 3, or 4, keep the tens digit unchanged.
- If the ones digit is 5, 6, 7, 8, or 9, add 1 to the tens digit.
- After rounding, the ones digit becomes 0.

Rounding numbers to the nearest hundred:
- Keep the hundreds digit unchanged if the tens digit is 1, 2, 3, or 4.
- Add 1 to the hundreds digit if the tens digit is 5, 6, 7, 8, or 9.
- After rounding, both tens and ones digits become 0.

Answers:
a, Rounding the number 53 to the nearest ten gives 50.
b, Rounding the number 95 to the nearest ten gives 100.
c, Rounding the number 620 to the nearest hundred gives 600.
d, Rounding the number 974 to the nearest hundred gives 1000.

2. Solve Exercise 2 Page 37 Math Grade 3

Problem: Which statements are correct and which ones are incorrect?
From the position of the road sign:
a, About 200 km more to reach the city of Lao Cai.
b, About 100 km more to reach the city of Yen Bai.
c, About 50 km more to reach the city of Viet Tri.
d, About 10 km more to reach the city of Vinh Yen.

Solution: Observe the image and apply rounding to the nearest hundred and ten to compare with the problem to determine the correctness of each statement.

Answer:
a) Rounding the number 259 to the nearest hundred gives 300 (Because the tens digit of 259 is 5).
Therefore, statement a is incorrect.
b) Rounding the number 116 to the nearest hundred gives 100 (Because the tens digit of 116 is 1).
Therefore, statement b is correct.
c) Rounding the number 48 to the nearest ten gives 50 (Because the ones digit is 8).
Therefore, statement c is correct.
d) Rounding the number 19 to the nearest ten gives 20 (Because the ones digit is 9).
Therefore, statement d is incorrect.

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Problem: Number?

Round the number 352 to the nearest hundred, what do you get?

Solution:

To round numbers to the nearest hundred: - If the tens digit is 1, 2, 3, or 4, keep the hundreds digit unchanged. - If the ones digit is 5, 6, 7, 8, or 9, add 1 to the hundreds digit. - After rounding, the tens and ones digits become 0.

Answer: Rounding the number 352 to the nearest hundred gives 400 (Because the tens digit is 5).

So, solving exercises on page 37 of Math 3 Volume 1 textbook, the book Horizon of Innovation, has been thoroughly guided here. Refer to it for accurate exercise completion. Also, remember to work on exercises in the exercise book to reinforce your knowledge.