Add and subtract decimals.
Perform addition and subtraction of decimals to solve equations accurately.

🙂 = Correct, ☹️ = Incorrect

📌 Rules

• Align the decimal points vertically: When setting up column addition or subtraction, line up the decimal points in a straight vertical row so that digits with the same place value (ones, tenths, hundredths) align correctly.

• Use placeholder zeros: Fill any empty spaces at the end of decimal numbers with zero so both numbers have the same number of decimal places. For example, to calculate 5.4 – 2.18, rewrite 5.4 as 5.40 before subtracting.

💡 Tips

• Carry and exchange as usual: Addition and subtraction work exactly the same as with whole numbers—carry over to the left when adding sums of 10 or more, and exchange from the column on the left when subtracting a larger digit from a smaller digit.

• Quick typing on our platform: Typing your answer is designed to be super quick and simple! Just type plain digits or decimals like 7.58 or 3.22 without adding any spaces or extra words.

⚠️ Warnings

• Don’t forget to put the decimal point in your answer: Make sure you bring the decimal point straight down into your answer line in the exact same position.

• Do not align by the rightmost digit: Aligning 4.5 and 1.23 by the right edge causes you to add tenths to hundredths! Always line up by the decimal point.