Decimal values are parts of whole numbers, including tenths, hundredths and thousandths. You can add and subtract decimal numbers in the same way as whole numbers using place value charts. You can put ...

Addition and Subtraction Tricks Without Pen and Paper: Doing quick calculations without writing anything down can seem tricky, but with the right mental math techniques, students can easily learn to ...

At five years old, Parker Formaniuk can count up to 1,000 and write down numbers in the hundreds. His latest challenge is learning to add and subtract three digits. His father attributes his success — ...