Mastering Double-Digit Subtraction Skills

Grade 2 Mathematics Learning to subtract with tens and ones Building fluency step by step

What We'll Learn Today

Subtract two-digit numbers without regrouping Subtract two-digit numbers with regrouping Use tens and ones to help us subtract Explain our thinking like mathematicians

Number Talk: Let's Think Together!

Look at this problem: 42 - 27 What strategies could we use? How can tens and ones help us?

Understanding Place Value

Every two-digit number has TENS and ONES 42 = 4 tens + 2 ones We can see this with our blocks! Tens help us subtract larger amounts quickly

Let's Subtract Without Regrouping

Try this together: 45 - 23 Step 1: Subtract the ones (5 - 3 = 2) Step 2: Subtract the tens (4 - 2 = 2) Answer: 22

Regrouping: When We Need More Ones

Practice Regrouping Together

Let's solve: 53 - 26 We need to regroup because 3 < 6 Trade 1 ten for 10 ones Now we have 4 tens and 13 ones 13 - 6 = 7 ones, 4 - 2 = 2 tens Answer: 27

Partner Time: Subtraction Stories

{"left":"Work with your math partner\nRead your subtraction story card together\nUse blocks to solve the problem","right":"Explain your thinking to each other\nCheck each other's work\nBe ready to share with the class"}

Independent Practice Time

Solve 10 subtraction problems on your own Use your blocks if you need them Show your work on your dry erase board first Remember: subtract ones from ones, tens from tens Regroup when you need more ones!

Exit Ticket: Show What You Know!

Solve this problem: 64 - 38 Show your work Write one thing you learned about subtracting today