Adding with Partial Sums Grade 3

Math3rd Grade10 slidesUS curriculum
Adding with Partial Sums Grade 3

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Adding with Partial Sums
Slide 1

Adding with Partial Sums

Grade 3 Math Breaking Numbers Apart to Add Making Addition Easier!

What Are Partial Sums?
Slide 2

What Are Partial Sums?

Breaking apart numbers into smaller pieces Adding the pieces separately Putting the pieces back together Makes big numbers easier to work with!

Let's Break Apart 35!
Slide 3

Let's Break Apart 35!

Look at the number 35 What do you see? 3 tens and 5 ones 30 + 5 = 35

Our First Partial Sums Problem
Slide 4

Our First Partial Sums Problem

Let's try: 23 + 14 Break apart each number first 23 = 20 + 3 14 = 10 + 4

Add the Tens, Add the Ones
Slide 5

Add the Tens, Add the Ones

{"left":"Add the tens together: 20 + 10 = 30\nAdd the ones together: 3 + 4 = 7","right":"Now add your partial sums: 30 + 7 = 37\nSo 23 + 14 = 37!"}

Your Turn to Try!
Slide 6

Your Turn to Try!

Problem: 42 + 25 Step 1: Break apart the numbers Step 2: Add tens, then ones Step 3: Combine your answers

Why Does This Strategy Work?
Slide 7

Why Does This Strategy Work?

Think about place value Tens stay with tens Ones stay with ones We're organizing our thinking!

Let's Try a Bigger Problem
Slide 8

Let's Try a Bigger Problem

Problem: 56 + 38 56 = 50 + 6 38 = 30 + 8 Add tens: 50 + 30 = 80 Add ones: 6 + 8 = 14 Combine: 80 + 14 = 94

Practice Time!
Slide 9

Practice Time!

Try these problems using partial sums: 34 + 29 = ? 47 + 26 = ? Remember: break apart, add tens, add ones, combine!

Remember
Slide 10

Remember

Partial sums help us break big problems into smaller, easier pieces! When we understand place value, addition becomes much easier. Practice makes perfect!