Subtraction within 100: Tens and Ones (No Regrouping)

Free sample questions, a clear explanation, and 5 practice skills with an AI tutor that guides without giving the answer away.

Super Subtraction Detectives!

Hello, Math Explorer! Have you ever built a tall tower with LEGOs or blocks? Subtraction is just like taking some of those blocks away. Imagine you have a tower made of big ten-blocks and small one-blocks. When we subtract without regrouping, it's super easy! We just take some small blocks from the small pile and some big blocks from the big pile. We never have to break a big ten-block apart!

Let's Solve a Mystery: 58 - 23

The number 58 is like having 5 ten-blocks and 8 one-blocks. We need to take away 23 (that's 2 ten-blocks and 3 one-blocks).

Step 1: Look at the Ones! We have 8 small blocks and need to take away 3. Poof! How many are left?
8 ones - 3 ones = 5 ones
Step 2: Look at the Tens! We have 5 big ten-blocks and need to take away 2. Easy peasy!
5 tens - 2 tens = 3 tens

So, we have 3 tens and 5 ones left. Our answer is 35! See? You just solved the case!

Key Takeaway!

When you're a Subtraction Detective, always remember the secret clue: First subtract the ones, then subtract the tens!

A Real-World Adventure!

Let's help a friend! Lily had 76 colorful crayons. She used 30 of them to draw a giant rainbow. How many crayons does she have left?

We need to solve 76 - 30.

Let's look at the places. 76 is 7 tens and 6 ones. 30 is 3 tens and 0 ones.

Ones place: 6 - 0 = 6. The ones stay the same!

Tens place: 7 - 3 = 4. We have 4 tens left.

Solution: Lily has 46 crayons left to draw more amazing pictures!

Awesome work today, Superstar! You are doing a fantastic job with subtraction. Keep practicing, and you'll be a math whiz in no time!

Sample questions

1. You have 5 tens blocks. You take away 2 tens blocks. How many tens blocks are left?

○ 20

○ 70

✓ 30

○ 3

Answer: 30 — Think about counting back by tens. If you have 5 tens, and you take away 2 tens, how many tens are left?

2. There are 80 apples. 30 apples are eaten. How many apples are left?

○ 110

○ 40

○ 5

✓ 50

Answer: 50 — Imagine 8 groups of ten apples. Take away 3 groups of ten apples. How many groups of ten are left?

3. What is 60 minus 10?

○ 70

✓ 50

○ 10

○ 6

Answer: 50 — Count back 1 ten from 6 tens. What number comes before 60 when you count by tens?

Skills in this topic

Subtract multiples of 10 within 100 (e.g., 70 - 20) using concrete objects and number bonds.
Subtract a one-digit number from a two-digit number within 100 without regrouping (e.g., 28 - 5).
Subtract two-digit numbers within 100 without regrouping (e.g., 67 - 34) using place value strategies.
Solve subtraction equations within 100 (no regrouping) using mental math or pictorial models.
Analyze a real-world problem requiring subtraction of two-digit numbers without regrouping, and present the solution.

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