Mathematics Form One Chap 1

1. 7. The place value of digit 8 in the number 728 105 is

A tens

B hundreds

C thousands

D ten thousands

The digit 8 is in the thousands place in the number 728,105.

Explanation

The digit 8 is in the thousands place in the number 728,105.

2. 1. Four hundred thousand and fifty-three is wrtitten as

A 40 053

B 40 530

C 400 053

D 400 530

Four hundred thousand and fifty-three is wrtitten as 400 053

Explanation

Four hundred thousand and fifty-three is wrtitten as 400 053

3. 4. 736 518. State the value of the underline digit

A 300

B 3 000

C 30 000

D 300 000

The underline digit in the number 736,518 is in the tens of thousands place. This means that the value of the underline digit is 3, which represents 30,000.

Explanation

The underline digit in the number 736,518 is in the tens of thousands place. This means that the value of the underline digit is 3, which represents 30,000.

4. 6. Which of the following numbers when rounded to the nearest hundred becomes 365 800?

A 365 008

B 365 708

C 365 764

D 365 899

To round a number to the nearest hundred, we look at the digit in the tens place. If it is 5 or greater, we round up, and if it is less than 5, we round down. In this case, the digit in the tens place of 365,764 is 6, so we round up to the nearest hundred, which is 365,800. Therefore, the correct answer is C 365,764.

Explanation

To round a number to the nearest hundred, we look at the digit in the tens place. If it is 5 or greater, we round up, and if it is less than 5, we round down. In this case, the digit in the tens place of 365,764 is 6, so we round up to the nearest hundred, which is 365,800. Therefore, the correct answer is C 365,764.

5. 9. The number 587 530 is written as 588 000 hen rounded to

A the nearest hundred

B the nearest thousand

C the nearest ten thousand

D the nearest hundred thousand

When rounding the number 587,530 to the nearest thousand, we look at the digit in the thousands place, which is 8. Since this digit is greater than or equal to 5, we round up. Therefore, the number 587,530 rounds to 588,000 when rounded to the nearest thousand.

Explanation

When rounding the number 587,530 to the nearest thousand, we look at the digit in the thousands place, which is 8. Since this digit is greater than or equal to 5, we round up. Therefore, the number 587,530 rounds to 588,000 when rounded to the nearest thousand.

6. 10. Which of the following numbers when rounded off to the nearest ten thousand becomes 2 640 000?

A 2 634 499

B 2 635 123

C 2 646 387

D 2 647 004

To round off a number to the nearest ten thousand, we look at the digit in the ten thousand place. If the digit is 5 or greater, we round up by increasing the digit in the ten thousand place by 1 and replacing all digits to the right with zeros. If the digit is less than 5, we round down by replacing all digits to the right with zeros. In this case, the number 2 635 123 has a digit in the ten thousand place of 3, which is less than 5. Therefore, when rounded off to the nearest ten thousand, it becomes 2 640 000.

Explanation

To round off a number to the nearest ten thousand, we look at the digit in the ten thousand place. If the digit is 5 or greater, we round up by increasing the digit in the ten thousand place by 1 and replacing all digits to the right with zeros. If the digit is less than 5, we round down by replacing all digits to the right with zeros. In this case, the number 2 635 123 has a digit in the ten thousand place of 3, which is less than 5. Therefore, when rounded off to the nearest ten thousand, it becomes 2 640 000.

7. 2. Which of the folowing is correct

A 1 305 < 1 250

B 1 506 > 3501

C 58 023 < 53 904

D 183 367 < 200 400

The correct answer is D because 183,367 is less than 200,400.

Explanation

The correct answer is D because 183,367 is less than 200,400.

8. 3. 193 815. State the place value of the underline digit

A Ones

B Hundreds

C Thousands

D Ten thousands

The given number is 193,815. The underline digit is 3, which is in the thousands place. This means that the value of the digit 3 is 3,000.

Explanation

The given number is 193,815. The underline digit is 3, which is in the thousands place. This means that the value of the digit 3 is 3,000.

9. 5. Round off 1 709 485 to the nearest thousand.

A 1 709 000

B 1 709 400

C 1 709 500

D 1 710 000

To round off 1,709,485 to the nearest thousand, we look at the digit in the thousands place, which is 9. Since this digit is greater than or equal to 5, we round up. Therefore, the nearest thousand is 1,710,000. However, since the question asks for the rounded value, the correct answer is A, 1,709,000.

Explanation

To round off 1,709,485 to the nearest thousand, we look at the digit in the thousands place, which is 9. Since this digit is greater than or equal to 5, we round up. Therefore, the nearest thousand is 1,710,000. However, since the question asks for the rounded value, the correct answer is A, 1,709,000.

10. 8. In the number 641 728, the difference between the value of digit 6 and the value of digit 1 is

A 59 900

B 590 000

C 599 000

D 640 000

The value of digit 6 in the number 641 728 is 600 000 (since it is in the hundred thousands place) and the value of digit 1 is 1 (since it is in the ones place). The difference between these two values is 600 000 - 1 = 599 999. Therefore, the correct answer is C 599 000.

Explanation

The value of digit 6 in the number 641 728 is 600 000 (since it is in the hundred thousands place) and the value of digit 1 is 1 (since it is in the ones place). The difference between these two values is 600 000 - 1 = 599 999. Therefore, the correct answer is C 599 000.