Decimals
Every lesson explains the concept, works through examples, and gives you practice problems with full solutions. Work through them in order, or jump to the topic you need.
6 lessons
- Decimal Place Value: Reading and Writing DecimalsWhat each place after the decimal point is worth, how to read a decimal aloud, and how to write one in expanded form or as a fraction.
- Comparing and Ordering DecimalsHow to compare decimals by working left to right one place at a time, why a longer decimal is not automatically bigger, and how to put a list in order.
- Rounding Decimals to Any PlaceHow to round a decimal to the nearest whole, tenth or hundredth: find the place, look at the digit after it, and decide whether to round up or keep it.
- Adding and Subtracting DecimalsHow to add and subtract decimals by lining up the decimal points, why the alignment matters, and how to handle numbers with different lengths.
- Multiplying Decimals: Count the Decimal PlacesHow to multiply decimals by ignoring the points, multiplying as whole numbers, then counting the decimal places — and why that count is what it is.
- Dividing Decimals: Move the Point, Then DivideHow to divide by a decimal by shifting both numbers until the divisor is whole, why that shift is allowed, and how to divide a decimal by a whole number.