The page of a book consecutively numbered from 1 to 160 . How many digit are there in this numbering ?
The pages of a book are numbered consecutively from 1 through 120. There are ............ digits are there in this numbering.
one digit: (9-1):1+1=9
two digits: 2x((99-10):1+1)=180
from 100 to 120, we used: 3x((120-100):1+1)=63
So, total is: 9+180+63=252
The pages of a book are numbered consecutively from 1 through 120. There are ............ digits are there in this numbering.
dịch: một quyển sách đánh số trang liên tiếp tù 1 đến 120.Có ..... chữ số trong quyển sách này?
giải
từ 1 đến 9 có: 9 chữ số
từ 10 đến 99 có :90 số x 2=180 chữ số
từ 100 đến 120 có :21 số x 3 =63 chữ số
có tất cả là :9+ 180+ 63= 252 chữ số
The pages of a book are numbered consecutively from 1 through 120.
There are...... digits are there in this numbering.
hàng đơn vị : 9
hàng chục : 180
Hàng trăm : 63
9 +180 +63 =252
Đáp số 252
There are 210 digits are there in this numbering
the pages òf a book are numbered consecutively from 1 through 500. There are ......... digits are there in thí numbering
bai nay dich ra la 1 quyen sach co cach trang lien tiep tu 1 den 500 hoi quyen sach ay co bao nhieu chu so
bai gai
tu 1 den 9 co 9 chu so
tu 10 den 99 co (99-10):1+1*2=180cs
tu 100 den 500 co (500-100):1+1*3=1203cs
vay quyen sach do co so chu so la 9+180+1230=1392cs
d/s 1392 chu so
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)
A movie theatre has eleven rows of seats . The rows are numbered from 1 to 11 . Odd - numbered rows have 14 seats and even - numbered rows have 15 seats . How many seats are there in the theatre ?
Số ghế của dãy ghế có số lẻ là:
((11 – 1) : 2 + 1) x 14 = 84 ghế
Số ghế của dãy ghế có số chẵn là:
((10 – 2) : 2 + 1) x 15 = 75 ghế
Tổng số ghế là:
84 + 75 = 159 ghế
There are 159 seats in the movie theatre
I am a member of English online competition and i who sends some English math problems here
Thank you and about the solution you can discover and understand easily just show you the result
Darling! Thanks
159 chỗ ngồi đây là bài thi cấp tỉnh năm học 2015-2016
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
A,B,C,D,A+C,B+C,A+D,B+D represent 8 diffirent natural numbers from 1 to 8. If A is the largest number in the number from 1 to 8.Find A
How many natural numbers are there between 100 and 999 that unit-digit and tens-digit equal hundreds-digit ?
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 ~