Add 2-digit and 3-digit Numbers

By the end of this unit, students will be able to:

1. Add and subtract numbers with up to 3 digits, using formal written methods of columnar addition and subtraction;
2. Add and subtract multiples of 100;
3. Add and subtract 3-digit and 1-digit numbers;
4. Add and subtract numbers with up to 3 digits using a formal written method.

Curriculum Alignment: Year 3 Number: Addition and Subtraction

• Add and subtract numbers mentally, including:
  • a three-digit number and 1s
  • a three-digit number and 10s
  • a three-digit number and 100s
• Add and subtract numbers with up to 3 digits, using formal written methods of columnar addition and subtraction.