Adding Up: Mastering the Standard Algorithm

Year 1 & 2 Mathematics Building Strong Addition Skills NSW Curriculum Aligned

What We'll Learn Today

Year 1: Add numbers within 100 using tens and ones Year 2: Add 2-3 digit numbers with regrouping Use place value to make addition easier Follow the standard algorithm step-by-step

Warm-Up: Number Detective

Count forwards by 1s, 2s, and 10s Look at the number 47 - what do you see? How many tens? How many ones? Let's partition numbers together!

The Standard Algorithm Steps

Step 1: Line up the numbers by place value Step 2: Start adding from the ones column Step 3: If you get 10 or more, regroup to the tens Step 4: Continue with the tens column

Let's Solve Together: 46 + 37

Hands-On Practice Time

Year 1: Use blocks to add 25 + 34 Year 2: Try 156 + 78 with blocks and paper Work with a partner Check your work by counting the blocks

Success Criteria Check

{"left":"Year 1: I can split numbers into tens and ones\nYear 1: I can add using the standard algorithm\nYear 1: I can explain what each digit means","right":"Year 2: I can add with regrouping\nYear 2: I can follow all algorithm steps\nYear 2: I can check my work"}

Extension Challenges

Try adding three numbers: 24 + 15 + 33 Create your own problem with a sum over 200 Use addition to solve: 'I have 145 stickers, my friend gives me 67 more. How many do I have?' Check your answer using a different strategy