Finding The Number of Digits (Tìm số chữ số)

Presentation

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Mathematics

•

2nd - 5th Grade

•

Medium

Cuong Tran

Used 8+ times

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6 Slides • 10 Questions

Finding The Number of Digits

Tìm số chữ số

The Opening Problem

How many digits are used for the page numbers in a book that has 150 pages?
A book uses 312 digits altogether for its page numbers. How many page does the book have?

Example 1

How many digits are there from numbers 1 to 80?

Formula

$Number\ of\ Digits\ of\ n-digits\ group=\ n\times Number\ of\ Terms$

Multiple Choice

How many digits are there from numbers 1 to 60?

106

108

110

111

Multiple Choice

How many digits are there from numbers 1 to 120?

250

252

254

256

Multiple Choice

How many digits are there in a book that has 456 pages?

1260

1262

1264

1266

Fill in the Blanks

Type answer...

Fill in the Blanks

Type answer...

Fill in the Blanks

Type answer...

Example 2

A book uses 342 digits altogether for its page numbers. How many page does the book have?

Multiple Choice

71 digits are used to print the page numbers of a book. What is the last page number of the book?

Multiple Choice

222 digits are used to print the page numbers of a book. How many pages does the book have?

100

110

120

Fill in the Blanks

Type answer...

Fill in the Blanks

Type answer...

THANK YOU!

Finding The Number of Digits

Tìm số chữ số

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