How many zero digits are there in the million?
how many zero digits are there in ten millon???
There are sevens zero digits in ten million.
There are 7 zeros digits in ten milion
how many zero digits are there in ten million?
Dịch : có bao nhiêu chữ số 0 trong 10 triệu?
Đáp án : 7 chữ số 0
Hok tốt# =.=
PART 1: NUMBER AND DIGIT
Answer the questions
How many digits are there in the number 7,429?
Name the digits of the numbers 7,429?
How many digits are there in the number 264?
Name the digits of the numbers 264?
7,429 has 4 digits
it: 7, 4, 2, 9
264 has 3 digits
it: 2, 6, 4
How many digits are there in the number 7,429?
………………………………………………………………………………………………………………
Name the digits of the number 7,429?
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Is the number 7,429 odd or even? Why?
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How many digits are there in the number 264?
…………………………………………………………………………………………………….................
Name the digits of the number 264?
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Is the number 264 odd or even? Why?
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1. There are four digits in the number 7,429.
2. They are seven, four, two and nine in the number 7,429.
3. The number 7,429 is odd. Because the number end in 9.
4. There are three dgits number in the number 264.
5. They are two, six and four in the number 264.
6. The number 264 is even. Because the number end in 4.
How many positive three-digits numbers are there in which the sum of the digits is old?
Trình bầy cách giải thì mới đc chọn
A book has 250 pages starting at number 1. How many digits are there in the page numbers of the book?
ok
1 to 9 have 9 numbers
10 to 99 have 90 numbers
100 to 250 have 151 numbers
in the book have 250 numbers
dich
1 toi 9 co 9 chu so
10 toi 99 co 90 chu so
100 toi 250 co 151 chu so
trong cuon sach co 250 chu so
nho tink cho minh nha
Số trang sách có 1 chữ số là: 9 - 1 + 1 = 9 (trang). Suy ra: Số chữ số của những trang này là: 9 (chữ số)
Số trang sách có 2 chữ số là: 99 - 10 + 1 = 90 (trang). Suy ra: Số chữ số của những trang này là: 90 x 2 = 180 (chữ số)
Số trang sách có 3 chữ số là: 250 - 100 + 1 = 151 (trang). Suy ra: Số chữ số của những trang này là: 151 x 3 = 453 (chữ số)
Tổng các chữ số của quyển sách là: 9 + 180 + 453 = 642 (chữ số)
1.give N= 1x2x3x........x50.How many the last digits 0 are there
Analyze all factors that really collect divisor is 5. We have:
1 × 5 = 5, 15 = 3 × 5, 25 = 5 × 5, 35 × 5 = 7, 45 = 9 × 5
10 = 2 × 5, 4 × 20 = 5, 30 = 6 × 5, 40 × 5 = 8, 50 = 2x5x5
In 10 charge on all 12 factors 5
Each factor of 5 to 1 that's another even number of administration will have to take the first digit 0
So take advantage of administration area for Bag 12 digits 0
Analyze all factors that really collect divisor is 5. We have: 1 × 5 = 5, 15 = 3 × 5, 25 = 5 × 5, 35 × 5 = 7, 45 = 9 × 5 10 = 2 × 5, 4 × 20 = 5, 30 = 6 × 5, 40 × 5 = 8, 50 = 2x5x5 In 10 charge on all 12 factors 5 Each factor of 5 to 1 that's another even number of administration will have to take the first digit 0 So take advantage of administration area for Bag 12 digits 0
Thừa số 5 xuất hiện lần 1 ở các số: 5 ; 10 ; 15 ; ... ; 50 gồm ( 50 - 5 ) : 5 + 1 = 10 ( lần )
Thừa số 5 xuất hiện lần 2 ở các số 25 và 50 gồm 2 lần
Số thừa số 5 xuất hiện ở tích N là: 10 + 2 = 12 ( lần )
Cứ mỗi thừa số 5 nhân với 1 thừa số chẵn ta được 1 chữ số 0. Mà số thừa số chẵn là ( 50 - 2 ) : 2 + 1 = 25 ( thừa số ) lớn hơn số thừa số 5
=> Tích N có tận cùng là 12 chữ số 0
Vậy tích N có tận cùng là 12 chữ số 0
A book has 250 pages starting at number 1. How many digits are there in the page numbers of the book?
P/s: Math Violympic: Grade 5, Round 2
From 1 to 9 have 9 numbers with 1 digit. So there are 9 digits.
From 10 to 99 have 90 numbers with 2 digits. So there are: 90 x 2 = 180 ( digits )
From 100 to 250 have 151 numbers with 3 digits. So there are: 151 x 3 = 453 ( digits )
The book needs the number of digits:
9 + 180 + 453 = 642 ( digits )
Answer: 642 ditgits
How many four-digit integers greater than 5000 are there for which the thousands digits equals the sum of the other three digits?
Toán tiếng anh,giúp với
Combinatorics
21. 15 students join a competition. Only top 5 students can be promoted to next round. How many different way(s) of promotion advance is / are there?
Different way: Cách khác nhau.
22. It is known that there are 8 classes of grade 5 in a primary school. At least how many students are there in grade 5 to ensure there exist 41 students in the same class?
At least: Ít nhất; Ensure: Chắc chắn; Exist: Tồn tại.
23. Choose 3 digits from 1, 2, 3, 4, 6, 8 and 0 to form 3-digit numbers. How many even number(s) greater than 300 is / are there? (The repetition of digits is not allowed)
Digit: Chữ số; 3-digit number: Số có 3 chữ số; Even number: Số chẵn; Greater than: Lớn hơn; Repetition of digits is not allowed: Các chữ số không được lặp lại.
24. A flight of stairs has 10 steps. Peter can go up for 1 step, 2 steps or 3 steps each time. How many way(s) is / are there for Peter to go up the stairs?
Step: Bước; Way: Cách.
25. Numbers are drawn from 80 integers 20 to 99. At least how many number(s) is / are drawn at random to ensure that there are two numbers whose sum is 85?
Integer: Số nguyên; At least: Ít nhất; Random: Ngẫu nhiên; Ensure: Chắc chắn; Sum: Tổng.
~ End of Paper ~
là seo pạn?mik hem hỉu??????????????????????
Đọc cái bài mà mún trầm kẻm!
Combinatorics
21. 15 students join a competition. Only top 5 students can be promoted to next round. How many different way(s) of promotion advance is / are there?
Different way: Cách khác nhau.
22. It is known that there are 8 classes of grade 5 in a primary school. At least how many students are there in grade 5 to ensure there exist 41 students in the same class?
At least: Ít nhất; Ensure: Chắc chắn; Exist: Tồn tại.
23. Choose 3 digits from 1, 2, 3, 4, 6, 8 and 0 to form 3-digit numbers. How many even number(s) greater than 300 is / are there? (The repetition of digits is not allowed)
Digit: Chữ số; 3-digit number: Số có 3 chữ số; Even number: Số chẵn; Greater than: Lớn hơn; Repetition of digits is not allowed: Các chữ số không được lặp lại.
24. A flight of stairs has 10 steps. Peter can go up for 1 step, 2 steps or 3 steps each time. How many way(s) is / are there for Peter to go up the stairs?
Step: Bước; Way: Cách.
25. Numbers are drawn from 80 integers 20 to 99. At least how many number(s) is / are drawn at random to ensure that there are two numbers whose sum is 85?
Integer: Số nguyên; At least: Ít nhất; Random: Ngẫu nhiên; Ensure: Chắc chắn; Sum: Tổng.
~ End of Paper ~