## Description

Learners are introduced to numbers greater than 100 and develop skills and methods for adding and subtracting using 2– and 3-digit numbers. They begin with adding or subtracting a 1-digit number from a 3-digit number but progress to adding and subtracting 3-digit numbers to and from each other. In this unit the learner also finds out about estimating, and checking answers, important skills to ensure that they avoid unnecessary mistakes.

**Year 3 Addition and Subtraction** consists of:

**Parent/tutors guide****Addition and Subtraction 1**– I can; add and subtract a 3-digit number and ones mentally; and add and subtract using a formal written column method.**Addition and Subtraction 2**– I can; subtract a 1-digit number from a 3-digit number; and use exchange in column subtraction.**Addition and Subtraction 3**– I can add and subtract multiples of 10 and 100 to and from 3-digit numbers.**Addition and Subtraction 4**– I can add and subtract a 2-digit number to and from a 3-digit number.**Addition and Subtraction 5**– I can add and subtract 3-digit numbers to and from each other.**Addition and Subtraction 6**– I can estimate the answer to a calculation and use inverse operations to check answers.