Mathematics for Class 5
NUMBERS AND ARITHMETIC OPERATIONS
(Numbers up to one billion)
1.1 Numbers up to one billion
Read numbers up to one billion in numerals and in words
Concept of One Billion
We have learnt in Class IV that the smallest number of nine digits is 100000000 (one hundred million).
Look at the number "34,768,172"
- How many millions are in 34,768,172
- How many thousands are in 34,768,172
- How many ones are in 34,768,172
- Write 34,768,172 in words.
We know that the greatest number of nine digits is 999,999,999 read as "Nine hundred ninety nine millions, nine hundred ninety nine thousands and nine hundred ninety nine". When we add one more to it, then
999,999,999 + 1 = 1,000,000,000
Teacher's Note: After revision of numbers in millions, teacher should help students to develop the concept of one billion by counting numbers of digits by using flash cards or other related material.