Understand the Indian numeral system formatting and decompose large numbers into place values via iterative addition.
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Introduce the comma placement rule for the Indian system.
One hundred thousand is a big number! In the Indian Number System, we call this special milestone One Lakh.
A lakh is written as a followed by zeroes: 1,00,000.
Worked example translating numbers to words and words to numbers.
Problem. Write the number name for and convert the phrase 'Fifty lakhs five thousand and fifty' into a numeral with proper commas.
Faded practice for number name conversion.
Let's translate large numbers into words and numerals. The number name for 70,53,138 is Seventy lakh fifty three thousand one hundred . To write 'Four lakh seven thousand seven hundred and four' in numbers, we must place commas following the Indian pattern. Placing the digits into their respective periods gives us the numeral .
Using imaginary calculators to understand place value decomposition.
Imagine you live in the Land of Tens, where calculators are a bit unusual. Instead of normal digit buttons, they only have special addition buttons.
Formula defining a number broken down into powers of ten.
The digit tells you exactly how many times to press the button for that place value.
This means pressing +1000 five times, +10 seven times, and +1 two times.
Find combinations of button presses to create a number.
Problem. Creative Chitti's calculator has buttons for , and so on. What is the smallest number of button clicks needed to get the number on the screen?
