Add and subtract whole numbers carefully to solve the questions. Don’t include any symbols.

🙂 = Correct, ☹️ = Incorrect

📌 Rules

• Line up your numbers in neat vertical columns using place value, matching units with units, tens with tens, and hundreds with hundreds.

• When adding, if a column adds up to 10 or more, carry the extra digit over to the next column on the left.

• When subtracting, if the top digit is smaller than the bottom digit, exchange 1 from the column on the left before you subtract.

💡 Tips

• Use a quick estimation by rounding numbers first so you know roughly what your answer should look like.

• Writing column headings like Th, H, T and U above your calculation helps keep every digit in the correct place.

• Typing your answer on our platform is quick and simple: just type plain digits like 15400 without adding any commas or spaces, because the input fields handle everything automatically for you.

⚠️ Warnings

• Always start your calculations from the right column (the units) and work your way left.

• Remember to include any carried digits in your total, or reduce a column’s value if you exchanged from it during subtraction.