Numbers & Place Value

The Place Value House Grows Up

Eight rooms in the place value house: Ones → Crores.

The Indian System

Commas mark the periods, thousand, lakh, crore.

The International System

Periods of 3, thousand, million, billion.

Reading & Writing Large Numbers

Read period-by-period, don't lose the zeros.

Roman Numerals

I V X L C D M, add or subtract by position.

Rounding Big Numbers

Peek at the next digit, 5 up, 4 down.

Integers

Integers stretch both ways from zero on the number line.