1.
What is the missing number in 2 131 071= 2 000 000 + __________________30 000 + 1000 + 70 + 1
Explanation
The missing number in the given sequence is 100,000 or 100,000. This can be determined by adding up all the numbers on the right side of the equation, which equals 2,131,071. Subtracting the known numbers, 2,000,000, 30,000, 1,000, 70, and 1, from this total will give us the missing number, which is 100,000.
2.
What is eight million, two hundred eight thousand and fourteen
Correct Answer
D. 8 208 014
Explanation
The correct answer is 8 208 014 because it is the only option that matches the given number, "eight million, two hundred eight thousand and fourteen." The other options do not include the correct number of zeros or have different digits in the thousands or hundreds place.
3.
What is the value of the digit 5 in this number? 1 050 413
Correct Answer
B. 50 thousand
Explanation
The value of the digit 5 in the number 1,050,413 is 50 thousand. This is because the digit 5 is in the thousands place, indicating that it represents 5 sets of one thousand.
4.
Which number is exactly 200 000 more than 5 317 165?
Correct Answer
D. 5 517 165
Explanation
The correct answer is 5 517 165. This is because the question asks for a number that is exactly 200,000 more than 5,317,165. Adding 200,000 to 5,317,165 gives us 5,517,165, which matches the given answer.
5.
Round the following number to the nearest 100 000: 6 729 675
Correct Answer
6 700 000
Explanation
The given number, 6,729,675, is rounded to the nearest 100,000. When rounding to the nearest 100,000, we look at the digit in the hundred thousands place, which is 7. Since this digit is greater than or equal to 5, we round up by increasing the digit in the hundred thousands place by 1. Therefore, the rounded number is 6,700,000.
6.
Sara has one of these four cards:
775 105, 778 013, 765 101, 772 989
She says, “When I round my number to the nearest 10 000, I get 770 000”. Which cards could be Sara’s card?
Correct Answer
B. 765 101 and 772 989
Explanation
Sara's number rounds to 770,000 when rounded to the nearest 10,000. In the given options, only the numbers 765,101 and 772,989 round to 770,000 when rounded to the nearest 10,000. Therefore, these two cards could be Sara's cards.
7.
Which of these numbers is forty six billion, three hundred twenty-four million and five?
Correct Answer
A. 46,324,000,005
Explanation
The correct answer is 46,324,000,005 because it is the only option that matches the given number of forty six billion, three hundred twenty-four million and five. The other options either have incorrect placement of zeros or have incorrect digits in the millions and billions place.
8.
What is the value of the underlined digit? 6 451 956 077
Correct Answer
B. 6 billion
Explanation
The underlined digit in the number 6 451 956 077 is 6. In this context, the term "billion" refers to a value that is equal to one thousand million or 1,000,000,000. Therefore, the value of the underlined digit is 6 billion.
9.
Our number system has 10 digits.
Correct Answer
A. True
Explanation
Our number system has 10 digits because it is based on the decimal system, which uses a base of 10. This means that we have 10 unique symbols (0-9) to represent all possible values. This system allows us to easily represent and manipulate numbers of any magnitude using a combination of these 10 digits.
10.
Write 4 x10^{8 }in standard form.
Correct Answer
400 000 000, 400,000,000
Explanation
The given number, 4 x 10^8, is already in standard form. It represents the value 400,000,000.